Imagine setting two cups of coffee in front of you. Same farm. Same harvest. Same roast level. Same skilled barista preparing both. You take a sip from the first cup and find bright citrus notes, a clean finish, and a floral aroma that rises gently from the rim. You take a sip from the second and find deep berry sweetness, a heavier body, and something almost wine-like lingering on your palate. You look at the person next to you, slightly confused. How is this possible? The only variable was the processing method used after harvest.
This is not a hypothetical scenario. Coffee processing methods and how they affect flavor and aroma sit at the center of everything that shapes what ends up in your cup. For most coffee drinkers, processing remains invisible, a word on a bag that rarely gets explained. For us at Buddha's Cup in Holualoa, Hawaii, it is anything but invisible. We grow, harvest, process, and roast our Kona coffee on our own farm on the slopes of Hualalai volcano. Every decision we make between picking a ripe cherry and sealing a bag of roasted beans has flavor consequences. This question is part of our daily work.
Holualoa sits at roughly 1,400 feet elevation on the western slope of the Big Island, inside the famous Kona coffee belt. Our mornings are sunny and warm. Our afternoons bring clouds and light rain. That rhythm creates ideal growing conditions and also shapes the microbial environment that plays such a critical role in fermentation-based processing. When we talk about processing, we are talking about something deeply connected to this specific place.
This article walks through each major processing method in full. We cover the science behind how they work, what they produce in the cup, and what they mean for Kona coffee specifically. If you want to understand what you are tasting and why, start here. And for a broader look at the full journey from tree to bag, we recommend reading From Cherry to Cup: The Full Journey of Kona Coffee Beans alongside this piece.
What Happens Inside a Coffee Cherry Before Processing Begins
To understand how processing methods shape flavor and aroma, you need to understand what a coffee cherry actually is before anything is done to it. The cherry is not just packaging. It is a living system packed with compounds that become the flavors you taste in your cup. Processing determines which of those compounds survive, which are amplified, and which are stripped away entirely. Without this foundation, the differences between washed, natural, honey, and anaerobic methods are just labels. With it, they become logical outcomes of chemistry and biology.
The Anatomy of a Coffee Cherry and Why It Matters
A coffee cherry has several distinct layers, and each one plays a role in flavor development. Working from outside to inside, you have the outer skin, which is the red or yellow outer layer you see when a cherry is ripe. Beneath the skin is the mucilage, a dense, sticky, sugar-rich layer that clings to the parchment beneath it. Inside the mucilage sits the parchment, a protective papery shell. Under the parchment is the silver skin, a thin membrane that often burns off during roasting. And at the center are one or two coffee beans, the seeds of the fruit.
The mucilage is the key player in flavor development at the processing stage. It is rich in sugars, pectin, and organic acids. These compounds are the raw material for fermentation. When microbes encounter the mucilage, they begin metabolizing these sugars and producing byproducts, including alcohols, organic acids, and aromatic esters. Some of those compounds migrate into the bean and become flavor precursors, the molecular raw material that transforms into aroma and taste during roasting.
The composition of the mucilage varies by variety, ripeness, and even the specific microclimate where the cherry grew. This is one reason why terroir matters so much in coffee. Two farms using the same processing method can produce cups with distinctly different flavor signatures because the starting chemistry of their cherries is different.
Flavor Precursors and Why Scientists Are Paying Attention
Flavor precursors are compounds that do not taste or smell like much on their own but transform into aromatic and flavor molecules during roasting. Sucrose, for example, breaks down during the Maillard reaction and caramelization to form dozens of compounds responsible for coffee's roasted complexity. Free amino acids combine with reducing sugars to create the browning reactions that produce everything from nutty notes to chocolatey depth. The processing method determines how many of these precursors survive into the green bean and in what proportions.
Recent metabolomics research using UPLC-ESI-MS/MS analysis found that processing method directly determines which flavor precursors survive into the green bean. This kind of molecular-level research is changing how producers and roasters think about processing decisions. It is no longer enough to say that natural processing produces fruitier coffee. Scientists can now identify which specific compounds are present in higher concentrations in natural-processed beans compared to washed beans, and trace exactly how those compounds contribute to what a taster perceives in the cup.
Lipids are another underappreciated category of flavor carriers. A 2025 lipidomics study found 510 distinct lipids across 27 subclasses in coffee beans, and roughly 150 of them changed significantly depending on processing method. Lipids contribute to body, mouthfeel, and the perception of richness. They also influence how volatile aromatic compounds are released during brewing. This means that processing is not just about sugars and acids. It is shaping the full sensory architecture of the cup in ways researchers are only beginning to map comprehensively.
The Role of Microbes, Oxygen, and Time
The coffee cherry arrives from the tree with a natural microbial population already on its surface. Yeasts, lactic acid bacteria, acetic acid bacteria, and other microorganisms are present before any deliberate fermentation begins. As soon as the cherry is harvested and begins processing, these microbes start working. What they do, and how intensely they do it, depends on three variables: the specific microbial community present, how much oxygen is available, and how much time they have to work.
Oxygen availability is a critical variable. When oxygen is present, aerobic microbes dominate and produce certain kinds of organic acids and aromatic compounds. When oxygen is excluded, anaerobic strains take over and produce a very different set of metabolites. This is exactly the principle behind anaerobic fermentation processing, which we cover in detail later in this article. The shift in microbial dominance is not subtle. It produces dramatically different flavor outcomes that experienced tasters can identify reliably.
Time is equally important. The longer the cherry or the depulped bean remains in contact with the fruit material or fermentation environment, the more microbial activity occurs and the more compounds migrate into the bean. A natural-processed coffee dried over three weeks has absorbed far more from the fruit than a washed coffee where the mucilage was removed within 24 hours of harvest. Every hour of contact time is a flavor decision, even when it is not framed that way.
At our farm in Holualoa, we work within a specific microbial starting point. The volcanic soil of the Kona coffee belt contributes mineral compounds and supports a distinctive local ecosystem of organisms. Our afternoon rains and humid air create fermentation conditions that are different from those in Ethiopia, Colombia, or Sumatra. This is part of why Kona coffee processed using the same methods as coffee from other origins still tastes like Kona. If you want to explore how this volcanic foundation influences flavor even before processing begins, read our piece on The Impact of Volcanic Soil on the Flavor of Kona Coffee.
Washed Processing: Clarity, Brightness, and the Clean Cup
Washed processing is the method that most specialty coffee drinkers encounter first, though many never learn its name. It is the dominant method in East Africa, Central America, and many parts of Colombia. In the Kona coffee belt, washed processing has a long history and continues to produce cups that showcase the region's distinctive terroir with remarkable clarity. If you have ever tasted a coffee described as bright, clean, or transparent, it was almost certainly washed processed. Understanding why requires a close look at how the method actually works.
How Washed Processing Works Step by Step
Washed processing begins immediately after harvest. Ripe cherries are sorted and then run through a depulper, a machine that removes the outer skin and much of the mucilage in a single pass. What remains is the parchment-covered bean, still coated with some residual mucilage. These beans go into a fermentation tank, typically filled with water, where they rest for anywhere from 12 to 48 hours depending on ambient temperature, the specific microbial community present, and the flavor targets of the producer.
During this fermentation period, naturally occurring enzymes and microbes break down the remaining mucilage. When fermentation is complete, the beans are thoroughly washed with clean water to remove all residual fruit material. At this point, the parchment-covered beans are dried, either on raised beds, drying tables, or mechanical dryers, until they reach a stable moisture content of around 11 to 12 percent. The drying phase happens with minimal fruit contact because the fruit has already been removed.
Sensory research consistently finds that wet-processed coffee scores higher on cleanliness compared to other methods. The removal of the fruit layer before drying means that fewer fermentation-derived compounds migrate into the bean. What you get in the cup is a more direct expression of the bean itself rather than the fermentation environment. For more detail on how we approach washed and natural processing at Buddha's Cup, see our post on Washed and Natural Coffee Beans: Learn About Our Coffee Processing Methods.
What Washed Processing Does to Flavor and Aroma
By removing most of the fruit-derived sugars before they can influence the bean, washed processing strips away the heavy sweetness and deep body that characterize natural-processed coffees. What it reveals instead is the inherent character of the bean, shaped by the variety, the soil, the elevation, and the climate where it grew. Cup clarity is the defining characteristic. You taste the coffee, not the fermentation.
Floral and citrus aromatics tend to dominate in washed coffees. Jasmine, bergamot, lemon, and stone fruit notes are common descriptors. Acidity is typically pronounced and bright, often described as clean or juicy rather than sharp or sour. Sweetness exists but registers lower on sensory evaluations compared to natural and anaerobic methods. The body is usually lighter to medium, allowing the aromatic complexity to shine without being weighted down.
This method works particularly well with high-altitude Arabica coffee where the bean's intrinsic character is strong and worth showcasing. At elevations above 1,000 feet, slower cherry development produces beans with more complex organic acid profiles and denser cellular structures. Washed processing lets those characteristics speak clearly. For a deeper look at how acidity functions in coffee flavor and why it matters, our article on What Is Acidity Level in Coffee and Why Is It Important covers the subject in full.
Washed Kona Coffee and What It Reveals
Kona's combination of elevation, volcanic mineral soil, cloud cover, and consistent rainfall creates a terroir that expresses itself beautifully in a washed cup. When we remove the fruit layer cleanly and let the bean dry without additional fermentation influence, what comes through is specific to this place. There is a brightness that feels different from Ethiopian washed coffees or Guatemalan washed coffees because the starting material, the bean and the soil that grew it, is different.
The natural acidity balance in Kona-grown Arabica is particularly well-suited to washed processing. Kona coffee tends toward a smooth, low-astringency acidity that washed processing preserves without amplifying into harshness. The result is a cup that is lively and nuanced without ever feeling aggressive. If you have been drinking blends or lower-grown coffees and found acidity unpleasant, a well-processed washed Kona may change your perspective entirely. For a full picture of what makes this coffee so distinctive in the first place, read What Makes Kona Coffee So Special.
Natural (Dry) Processing: Fruit, Sweetness, and Complexity
Natural processing, also called dry processing, is the oldest method humans have used to prepare coffee for roasting. Before the invention of depulping machinery and fermentation tanks, coffee was simply spread out in the sun and dried as a whole cherry. The bean sat inside the fruit as it dried, absorbing compounds from the surrounding layers for weeks before it was hulled and prepared for roasting. This simplicity in method produces some of the most complex cups in the entire coffee world.
How Natural Processing Works Step by Step
After sorting to remove under-ripe or damaged cherries, whole intact coffee cherries are spread on raised drying beds or paved patios. They stay there for anywhere from two to six weeks, depending on humidity, temperature, and the depth of the cherry layer. Workers turn the cherries regularly, sometimes multiple times per day during the peak drying period, to ensure even moisture loss and prevent mold from developing on the bottom of the pile.
As the cherries dry, the fruit shrivels and the internal sugars concentrate. The bean is surrounded by the drying mucilage, parchment, and skin throughout this entire period. Microbial activity continues at a low level as the fruit dries, and the compounds produced during this extended contact migrate into the bean through the parchment. The dried cherries, which end up looking like dark raisins, are then hulled mechanically to remove the dried fruit layer and expose the green bean beneath.
The result is a green bean that has been marinating in its own fruit for weeks. This is a fundamentally different starting material than a washed green bean. The implications for flavor are dramatic. For more on how we handle both processing methods at our farm and why we make the choices we do, see our detailed write-up on Washed and Natural Coffee Beans: Learn About Our Coffee Processing Methods.
The Flavor and Aroma Signature of Natural Coffee
Natural-processed coffees are often described as the most polarizing in specialty coffee. Fans love them for their extraordinary sweetness, their heavy body, and their deeply layered fruit character. Critics sometimes find them too fermented, too unpredictable, or too far removed from what they consider classic coffee flavor. Both responses make sense given what the method actually does to the bean.
The flavor profile of a well-executed natural coffee typically includes notes of blueberry, strawberry, tropical fruit, or dark cherry. The body is full and sometimes almost syrupy. Perceived acidity is lower than in washed coffees because the fruit compounds interact with the acids in ways that soften their sharpness. Sweetness scores consistently come in higher for natural-processed coffees than for other methods across sensory evaluations. This is a direct result of the sugar-rich environment the bean sits in during the extended drying period.
The lipid profile of natural-processed beans differs substantially from that of washed beans. Research tracking 510 lipid compounds across 27 subclasses found that roughly 150 of them changed significantly depending on processing method, with natural processing producing the most distinct lipid signature. Lipids contribute to body and mouthfeel, and they also serve as carriers for volatile aromatic compounds. This means natural processing is not just adding fruitiness. It is reshaping the entire sensory architecture of the cup.
During roasting, the Maillard reaction, which is the complex set of chemical reactions between amino acids and reducing sugars that produces coffee's roasted flavor and aroma, behaves differently with natural-processed green beans. The higher sugar content and different amino acid profile create more intense browning reactions at equivalent roast temperatures. This means that roasters working with natural-processed Kona need to adjust their approach accordingly. We cover how roasting interacts with processing decisions in detail in a later section of this article.
Natural Processing Challenges in Hawaii's Climate
Natural processing is demanding in any environment, but Hawaii's humidity makes it particularly challenging. Kona's afternoons bring reliable cloud cover and light rain. This is wonderful for the coffee trees and for the character of the fruit, but it creates real difficulty for extended cherry drying. When ambient humidity stays high, moisture loss from the cherries slows significantly. If the cherries stay too moist for too long, unwanted microbes can establish themselves and produce off-flavors, most commonly described as onion-like, vinegary, or putrid. These defects are the reason natural processing has historically been less common in humid tropical regions.
Managing natural processing in Kona requires attentive monitoring, strategic bed placement to maximize airflow, and sometimes supplemental drying infrastructure to protect the cherries from afternoon rain. When it is done well, the reward is a cup that combines the tropical fruit character native to Hawaii's growing conditions with the volcanic-mineral base that only Kona soil provides. A well-executed natural Kona sits in a category of its own, different from Ethiopian natural, different from Brazilian natural, because the terroir underneath the fermentation character is completely distinct. For more on how that volcanic foundation expresses itself, revisit our article on The Impact of Volcanic Soil on the Flavor of Kona Coffee.
Honey Processing: The Middle Path Between Washed and Natural
Honey processing is the method that generates the most confusion among coffee buyers, usually because of its name. There is no actual honey involved. The name refers to the stickiness of the mucilage that is intentionally left on the bean during drying, though some also say it refers to the golden color the drying beans take on under the sun. Whatever the etymology, honey processing is not simply a midpoint between washed and natural. It has its own distinct flavor logic and produces results that neither of the other methods can replicate.
What Honey Processing Actually Means
In honey processing, the coffee cherry is depulped to remove the outer skin, just as in washed processing. But unlike washed processing, the mucilage is intentionally left on the parchment-covered bean during drying. No water washing step removes it. The bean, still coated in its sticky mucilage layer, goes directly to the drying beds.
The amount of mucilage retained determines which category of honey process the coffee falls into. Yellow honey retains the least mucilage, dries fastest, and produces a cup closest to washed in profile. Red honey retains more, takes longer to dry, and sits in the middle of the flavor spectrum. Black honey retains the most mucilage, requires the most careful monitoring during drying, and produces a cup closest to natural in its depth and sweetness. Some producers also offer white honey, which sits between yellow and washed, though it is less common. For more background on this method and its flavor implications, our dedicated post on Honey Coffee goes deeper.
How Mucilage Retention Shapes Flavor and Body
The retained mucilage does not just sit passively on the bean during drying. It ferments slowly as it dries, and this controlled, gradual fermentation produces a specific set of organic acids and ester precursors that differ from both washed and natural fermentation. The result in the cup is a distinctive profile: sweeter and fuller-bodied than washed, but cleaner and more structured than natural. The acidity tends to be softer and rounder than in washed coffees, and the sweetness feels more integrated rather than fruit-forward.
Recent research into anaerobic processing variants that include honey-process elements found that black honey treatment obtained the highest scores for balance, bitterness, sweetness, and overall quality among the variants tested in a controlled sensory evaluation. This finding underscores that honey processing is not just a compromise. At its best, particularly in black honey form, it can outperform both washed and natural coffees on key sensory attributes. The specific fermentation chemistry of retained mucilage produces aromatic complexity that neither pure washed nor natural achieves in exactly the same way.
Body is a particularly notable characteristic of honey-processed coffees. The mucilage fermentation produces compounds that contribute to the perception of weight and texture in the cup. Many drinkers who prefer a fuller-bodied coffee without the intensity of natural processing find honey-processed coffees to be a satisfying middle ground. For context on how acidity interacts with body and sweetness in the overall cup experience, see our post on What Is Acidity Level in Coffee and Why Is It Important.
Honey Processing and Specialty Coffee Scoring
Honey-processed coffees have been appearing with increasing frequency at the top of specialty coffee scoring tables and competition results over the past decade. The SCA (Specialty Coffee Association) cupping protocol rewards balance, complexity, and clean sweetness, and well-executed honey-processed coffees often deliver all three. The mucilage fermentation contributes aromatic layers that add complexity without the wilder, more polarizing notes that some natural-processed coffees produce.
Consumer education remains a challenge. The name honey process creates confusion in ways that washed and natural do not. Buyers sometimes expect sweetness from an additive rather than from the process itself, and they can be confused when they learn that nothing sweet was added to the coffee during production. At Buddha's Cup, when we offer honey-processed Kona, we take time to explain what the name actually means and why the resulting cup tastes the way it does. Transparency about processing method is part of how we connect our customers to the work happening on the farm. For more on what elevates coffee to the specialty tier and how processing contributes to that designation, our article on What Makes Specialty Coffee Special provides useful context.
Anaerobic Fermentation: The Frontier of Intentional Flavor Design
Anaerobic fermentation processing is the most recent major development in the coffee processing world, and it is generating significant interest from both researchers and producers. Where older processing methods evolved organically from practical constraints and geographic conditions, anaerobic fermentation is intentional. It is a deliberate manipulation of the fermentation environment to produce specific flavor outcomes. The science behind it is sophisticated, the results are measurable, and the cups it produces are unlike anything traditional methods achieve. For producers in a premium coffee region like Kona, it represents both an opportunity and a responsibility to get it right.
What Anaerobic Fermentation Is and How It Works
Anaerobic fermentation processing involves sealing coffee, either as whole cherries or as depulped beans, inside oxygen-free vessels. These can be sealed stainless steel tanks, CO2-flushed containers, or other airtight systems designed to exclude ambient air. Without oxygen, the aerobic microbes that dominate conventional fermentation cannot thrive. A different set of microbes takes over, primarily anaerobic yeasts and lactic acid bacteria that produce a distinct set of metabolic byproducts.
These byproducts include lactic acid, acetic acid, malic acid, succinic acid, and a range of aromatic esters. The accumulation of CO2 as a fermentation byproduct also suppresses certain microbial populations and influences the chemical environment inside the vessel. Some producers monitor pH and CO2 levels throughout fermentation, adjusting timing based on these readings rather than fixed hour counts. This level of control is what makes anaerobic processing genuinely intentional in a way that conventional fermentation is not.
Two primary variants have emerged in research and commercial practice. Anaerobic fermentation wet processing (AFWP) involves sealing depulped, mucilage-on beans in liquid inside the tank. Anaerobic fermentation dry processing (AFDP) involves sealing whole cherries in tanks without added liquid, relying on the juice released from the fruit as it ferments under pressure. Each variant produces a different flavor signature because the starting material and the specific chemical environment differ significantly.
What the Research Says About Anaerobic Flavor Outcomes
The research on anaerobic fermentation processing is now substantial enough to draw clear conclusions. Anaerobically fermented coffee has scored higher than conventionally processed coffee on dry aroma, wet aroma, flavor, aftertaste, acidity, body, and overall balance in controlled sensory evaluations. These are not marginal improvements. Trained cuppers consistently distinguish anaerobic coffees and score them higher across multiple sensory attributes.
Anaerobic dry processing specifically has been shown to discover flavor precursors that are not activated by other methods. The metabolomics research using UPLC-ESI-MS/MS analysis identified distinct molecular signatures in anaerobically processed green beans that were absent or present in much lower concentrations in washed or natural-processed beans from the same origin. Some of these precursors produce aromatic compounds during roasting that contribute to the tropical, winey, and intensely fruity notes that anaerobic coffees are known for.
Microbial metabolism under anaerobic conditions produces organic acids and ester precursors indirectly. These compounds do not taste like the final aromatic molecules directly. Instead, they serve as building blocks that transform during roasting into the volatile compounds that reach your nose when you inhale over your cup. Research published in peer-reviewed journals has confirmed that the specific microbial community active during anaerobic fermentation produces a metabolite profile measurably different from aerobic fermentation, and that these differences persist through drying, milling, and into the green bean stage.
One particularly interesting finding from sensory research involved anaerobic processing variants applied to honey-process methods. In a controlled study, the black honey variant treated with anaerobic conditions obtained the highest overall quality scores among all variants tested, outperforming conventionally fermented and washed comparators on the specific attributes of balance, sweetness, and bitterness quality. This suggests that combining processing methods, using anaerobic fermentation in conjunction with partial mucilage retention, may represent an emerging frontier for high-quality coffee production.
Consumer Perception, Label Effects, and What Anaerobic Means for Buyers
Anaerobic fermentation introduces an interesting psychological dimension to the coffee-buying experience. Research on consumer perception found that label information about fermentation processing affects sensory and hedonic judgments even before a cup is tasted. Consumers who were told a coffee had undergone fermentation processing rated it differently both before and after tasting it compared to a control group that received no such information. This expectation effect means that how producers communicate about processing influences perceived quality independent of actual cup characteristics.
This finding carries a responsibility. When anaerobic processing is accurately communicated and genuinely executed, the expectation it creates is typically met or exceeded by the cup. When it is misused as a marketing term applied to ordinary fermentation or even artificially flavored coffees, it erodes trust and confuses buyers. The comparison between genuinely fermented coffees and artificially flavored coffees is instructive here. Research found that artificially flavored coffees had significantly fewer Maillard reaction products and lost approximately 55 percent of their flavor compounds within 14 days of roasting. The flavor in an artificially flavored coffee is added from outside. The flavor in an anaerobically processed coffee is built into the bean's molecular structure and survives through roasting and brewing in a fundamentally more durable way.
This is precisely the kind of transparency issue that the Kona coffee community has been fighting to address. Labels matter. Descriptions of processing methods matter. When buyers pay premium prices for Kona coffee, they deserve accurate information about what they are getting and how it was made. For background on labeling standards and the ongoing effort to protect coffee integrity in Hawaii, see our post on Kona Coffee Growers Push for Tighter Labeling Laws.
How Roasting and Brewing Interact With Processing Decisions
Processing does not operate in isolation. It sets up a flavor foundation that every subsequent decision either builds on or undermines. The roast level chosen for a washed coffee will produce different results than the same roast level applied to a natural-processed coffee from the same farm. The brewing method used for an anaerobic coffee will shape which of its distinctive aromatic compounds reach your nose and which are lost to heat or dilution. Understanding these interactions is what allows coffee drinkers and producers alike to get the most from each processing style.
How Roast Level Amplifies or Subdues Processing Character
Light roasts are, in general, the best tool for showcasing processing-derived character. When a coffee is roasted light, the heat-sensitive compounds produced during fermentation, particularly esters and certain acids, survive in greater concentrations. The floral notes in a washed Ethiopian, the berry character in a natural Costa Rican, the winey complexity in an anaerobic Kona: all of these express most clearly at lighter roast levels because the heat has not yet replaced them with roast-dominant compounds.
As roast level increases, the Maillard reaction and caramelization become increasingly dominant in the flavor profile. These reactions produce the dark chocolate, roasted nut, and bittersweet compounds that most people associate with medium and dark roast coffee. These compounds are genuinely delicious. But they compete with and eventually overwhelm the processing-derived character. A heavily darkened natural-processed coffee will taste much more like a dark roast than like its natural processing signature. The fruit character that required weeks of careful cherry drying to develop will be largely replaced by roast flavor.
The Maillard reaction also behaves differently depending on the green bean's starting chemistry. Natural-processed beans, with their higher residual sugar content, undergo more intense browning reactions at equivalent roast temperatures than washed beans. Roasters need to account for this difference in their roast curves. Applying the same profile to a natural-processed Kona that works for a washed Kona will likely result in an over-developed natural or an under-developed washed, neither of which expresses the processing character optimally.
Artificially flavored coffees, as a point of contrast, lose approximately 55 percent of their flavor compounds within 14 days of roasting regardless of roast level, because the added aromatic compounds are not bound to the bean's molecular structure the way fermentation-derived compounds are. This is one more reason why genuine processing methods, executed well, produce more lasting and authentic flavor than any shortcut. For a comprehensive look at how roasting decisions interact with the green bean, see our articles on The Differences Between Air Roasting and Drum Roasting Coffee Beans, The Difference Between a Medium Roast and a Dark Roast, and our overview of the Coffee Roasting Process.
How Brewing Method Interacts With Processing Character
Brewing method introduces another layer of complexity. Research on brewing temperature and ester compound preservation found that high-temperature brewing methods can destroy a significant portion of the aromatic esters that contribute to the most distinctive notes in fermented and naturally processed coffees. Decoction-style brewing, which involves extended boiling, is particularly destructive to these volatile compounds