How does the coffee beans process change sweetness and mouthfeel?
Natural and honey processing both leave sweetness and fermented notes in the cup, which is why the two are hard to tell apart without the bag description. The difference comes from how much mucilage stays on the seed during drying. Washed, natural and honey are the three traditional methods, and each shapes flavor alongside variety and growing environment.
Processing strips the skin, pulp and mucilage from the coffee berry layer by layer, leaving the seed inside its silver skin, then stabilizes it through drying. Handling errors let the sugars in the mucilage ferment and rot, tainting the green coffee bean. The natural drying workflow runs through sorting, drying, depulping and storage, with newer styles such as anaerobic natural and raisin honey.
In the world of specialty coffee, the processing method influences the final flavor no less than the variety and origin. Washed, natural, and honey are known as the three traditional processing methods, among which natural and honey are often hard to distinguish because both carry sweetness and fermentation notes. From the perspective of Front Street Coffee, this article first outlines the structure of the coffee berry and the principles of processing, then breaks down the complete workflows of natural processing and honey processing respectively, including key steps such as sorting, drying, depulping, and storage, and further introduces advanced techniques such as anaerobic natural and raisin honey. In the latter half, using two representative beans—Front Street Yirgacheffe Natural Red Cherry and Front Street Musician Series Bach—as examples, it provides roasting suggestions, cupping performance, and brewing parameters to help readers build a complete understanding from processing method to flavor in the cup.
Among the traditional ways of processing coffee beans, washed, natural, and honey are the three mainstays. Whether a specialty coffee can display outstanding flavor depends not only on variety and growing environment but also on the subsequent processing steps; a single misstep can undo all the effort that came before. Many enthusiasts often ask Front Street baristas: natural and honey both carry sweetness and fermented notes, so if you do not look at the description on the bean bag, how can you tell which processing method a bean used? In this article, Front Street will discuss exactly what differences exist between natural processing and honey processing.
Before getting into processing methods, let us first understand the structure of the coffee berry. From the outside inward, it consists of the skin, pulp, mucilage layer, parchment (also called the horny layer), silver skin, and at the very center the coffee seed. So-called processing is essentially removing the skin, pulp, and mucilage layer by layer, leaving the coffee bean wrapped in silver skin, and then stabilizing the bean through drying. It sounds simple, but doing it is quite time-consuming and labor-intensive—once handled improperly, the abundant sugars in the mucilage layer will ferment and rot, giving off a pungent odor and contaminating the coffee beans. Front Street has always believed that no matter which processing method is used, as long as it is operated properly, the mucilage layer can bring enormous flavor changes to the coffee bean, such as enhancing acidity, sweetness, and fermented notes.
Before processing, coffee farmers must select ripe red cherries. Why? Front Street offers an analogy: when an orange is still green, it tastes extremely sour; when it is green-yellow, sourness and sweetness interweave; once it turns fully orange, eating it leaves only sweetness. This comparison shows that when the organic acids in fruit have not yet fully converted into sugars, the flavor is naturally more sour; only after ripening does the fruit become sweet and delicious. The same applies to coffee berries—if picked and processed before fully ripe, the resulting coffee will taste both sour and astringent; whereas ripe fruit, because the mucilage layer is rich in sugar, can allow the coffee beans to show sweetness as long as processing is done properly.
Next is removing floating beans. After picking, the berries inevitably contain defective fruits. When they are poured into a water tank, ripe and intact fruits sink to the bottom, while rotten or poorly developed fruits float to the surface. This step is also crucial, as the saying goes, “one bad apple spoils the barrel.” Front Street believes that if defective beans are not removed in time, even a single rotten fruit during subsequent processing may taint the entire batch of coffee beans with a rotten flavor.
Back to the main topic: what is natural processing, and what is honey processing?
Natural Processing
Natural processing is one of the oldest and most traditional processing methods. After the coffee fruit is picked, it is dried directly in sunlight, and it is especially common in areas with abundant sunshine or scarce water resources; in Ethiopia, for example, nearly seventy percent of coffee fruit is processed naturally.
1. Collection and Sorting
After picking, the coffee fruit first undergoes manual hand sorting to remove defective fruits such as overripe, underripe, and insect-damaged ones, as well as foreign matter other than fruit.
2. Drying
The sorted fruit is sent to drying areas, and different regions use different drying facilities: some use tarps, some use raised beds, and some use concrete patios. The average drying time is three to four weeks, until the moisture content drops to 11% to be considered complete.
3. Depulping
After drying is complete, the fruit is sent to a processing plant for depulping and hulling, and some also undergo polishing. The skin, pulp, and other parts are all removed at this stage.
4. Sorting, Grading, and Storage
The depulped green beans are sorted again to remove beans with poor appearance. This step also reflects the quality of the drying process: over-dried beans are fragile in texture and easily break during depulping; under-dried beans have too high a moisture content, and the water is too active, making it easy for bacteria to grow and mold to occur.
In addition to traditional natural methods, the now-popular anaerobic fermentation technique has also been introduced into natural processing—coffee fruit is first placed in a sealed anaerobic environment to ferment before being dried in the sun, and this practice is called “anaerobic natural.”
Front Street Coffee believes that compared with washed and honey, natural coffee has the lowest acidity, the highest sweetness, and the clearest mouthfeel, but slightly inferior cleanliness. In flavor, it presents more berry-like notes and is also more complex in layers.
Honey Processing
Honey processing lies between washed and natural and is especially common in Costa Rica in the Americas. The practice of retaining part of the mucilage gives its coffee a unique taste different from washed and natural.
1. Collection
After picking, the fruit is first collected and sorted to select qualified coffee fruit.
2. Depulping
The sorted fruit is sent to a depulper, which removes the skin and pulp but retains the mucilage layer. Mucilage is the part of the coffee fruit with the highest sugar content and is also an important foundation of the fermentation process; it can be said that it determines eighty percent of the nutrient supply during processing. Yellow honey retains 60% of the mucilage, red honey retains 75%, and black honey removes almost no mucilage. The more mucilage retained, the richer the coffee's final flavor and the higher its sweetness.
3. Drying
Unlike washed processing, honey processing dries with part of the mucilage still attached. The entire drying process reduces the coffee beans' moisture content to about 11% and takes about 18 to 25 days, depending on climatic conditions and the processor's experience.
4. Storage
Once drying is complete, the coffee beans are bagged and stored in a warehouse, and hulling to remove the parchment layer is not carried out until just before export and transport.
Honey Processing Grades
In places such as Costa Rica, Brazil, or Colombia, processing plants used to use high-pressure washing machines, which removed pulp and skin while also taking away part of the mucilage. Based on the amount of mucilage remaining (40% to 100%), honey processing is divided into four grades: 40%, 60%, 80%, and 100%. Of course, some growers deliberately remove part of the mucilage to ensure that the coffee does not become too fruit-acidic due to excessive fermentation during drying.
Yellow Honey
The green coffee beans receive the longest exposure to light. A long light exposure means higher temperatures, so this coffee can complete drying within a week. Usually, the drying time of coffee depends on local climate, temperature, and humidity conditions.
Red Honey
The green beans take two to three weeks to dry, usually because of weather conditions or because they are placed in the shade. If the weather is sunny, growers will shade part of the sunlight to reduce light exposure time.
Black Honey
The green beans are dried in the shade for the longest time and receive the shortest light exposure. This coffee takes at least two weeks to dry. The black honey process is the most complex and has the highest labor cost, so its price is also the most expensive.
Front Street Coffee believes that coffee beans processed by the honey method perform relatively well in flavor, with balanced acidity and sweetness, and because they undergo sun drying, the coffee's own aroma is also amplified, with a thick body. At the same time, honey processing consumes less water and has a shorter drying time than natural processing, greatly speeding up green bean processing efficiency.
Raisin Honey Processing
The raisin honey processing method retains 100% mucilage and uses a zero-water process, increasing the difficulty of honey processing and imposing extremely strict requirements on timing control. On the day the coffee cherries are harvested, the fruit is poured into a large water tank; plump, ripe fruits sink to the bottom, while underdeveloped or overripe fruits float to the surface, and these floating beans need to be removed. The selected coffee cherries are placed on raised beds to dry for at least three days, then the cherry skin is removed, and drying continues with the mucilage retained. At this stage, climate factors are the key to the success of honey processing.
During drying, the coffee cherries need to be turned constantly to ensure even drying, but the frequency of turning must be well controlled—it must dry slowly enough to ensure the coffee undergoes fermentation processing, yet not so slowly that it over-ferments. This sweet raisin honey processing method gives the coffee a white-wine-like mouthfeel and balanced acidity, and the fermentation aroma is also relatively intense. Front Street believes that raisin honey processed coffee beans have a rich fermented quality as well as the sweetness of dried fruit.
Representative Coffee Bean for Natural Processing— Front Street Yirgacheffe Natural Red Cherry Coffee Beans
Country: Ethiopia
Region: Yirgacheffe
Altitude: 2300m
Variety: Local heirloom
Processing Method: Natural
Front Street Roasting Suggestions
The Yirgacheffe heirloom variety has small, relatively round beans, mostly between screen sizes 14 and 15. Yirgacheffe Natural Red Cherry has fairly uniform ripeness and clean flavor, so Front Street roasters use a medium-light roast to retain more floral and fruity acidity as well as the fermented aroma of ripe fruit.
Front Street uses a Yangjia 800N, charging 550g: using a fast-roast profile, charge when the drum temperature rises to 200°C, set the damper to 3.5, adjust the heat to 160°C after one minute, keep the damper unchanged, adjust the heat again at 148°C down to 130°C, roast until 5'03'', at 151°C the bean surface turns yellow, the grassy smell completely disappears, dehydration is complete, adjust the heat to 105°C, open the damper to 4; at the 8th minute, wrinkles and dark spots appear on the bean surface, and the toast aroma clearly turns into coffee aroma, which can be defined as the prelude to first crack; at this point listen clearly for the sound of first crack, which begins at 9'07'', reduce the heat to 70°C, open the damper fully (adjusting the heat must be very careful, not so low that there is no crackling sound), and drop the beans at 194°C.
Front Street Cupping Report
Representative Coffee Bean for Raisin Honey Processing— Front Street Musician Series Bach Coffee Beans
Country: Costa Rica
Region: Tarrazú
Altitude: 1,950M
Processing Method: Raisin Honey
Grade: SHB
Variety: Caturra
Front Street Roasting Suggestions
The green beans are yellow-green, the typical appearance of honey-processed coffee beans, and they smell of fresh ripe fruit aroma as well as a faint fermented fruity aroma. For the roasting direction of this bean, Front Street roasters aim for a medium-light roast: on the one hand, they want to retain bright acidity and display floral and fruity aromas; on the other hand, they hope to enhance richness and balance.
Yangjia 800N, charge 300g: preheat the drum to 180°C and charge, adjust the heat to 130, open the damper to 3, turning point at 1'43", keep the heat; at 140°C keep the heat unchanged, open the damper to 4. At 6'15" it turns yellow, the grassy smell disappears, and it enters the dehydration stage; at 151°C reduce the heat to 100, keep the damper at 4. At 176°C adjust the heat to 70, keep the damper unchanged. At 8'15" dehydration is complete, wrinkles and dark spots appear on the bean surface, and the toast aroma turns into coffee aroma, which is the prelude to first crack; at this point pay attention and listen for the sound of first crack. First crack begins at 9'40", open the damper fully to 5, keep the heat unchanged. Post-first-crack development time is 1'45", and drop the beans at 196°C.
Front Street Cupping Report
Front Street Coffee Brewing Suggestions
Dripper: V60
Water Temperature: 90°C
Dose: 15g
Coffee-to-Water Ratio: 1:15
Grind Size: Fine sugar (80% passing through China standard No. 20 sieve)
The setting used for coffee beans varies with altitude and roast level, so Front Street Coffee recommends recalibrating the grinder at regular intervals. To calibrate coffee grind size, you can use a standard No. 20 coffee inspection sieve. If you do not have a sieve at home, Front Street Coffee suggests judging by observing the flow rate: if the flow is too fast, the grind is too coarse; if the flow is too slow, the grind is too fine.
Front Street Coffee uses segmented extraction, also called three-stage brewing: use 30g of water for a 30-second bloom, pour in a small stream in circles until 125g for the first stage, and when the water level is about to expose the coffee bed, continue pouring until 225g and stop; when the water level is about to expose the coffee bed again, remove the dripper. (Timing starts at the beginning of the bloom.) The extraction time is 2'00"–2'10".
Natural Red Cherry brewed flavor: noticeable sweetness and acidity on entry, with lemon, berries, and fermented wine aroma; the lemony acidity in the finish is lasting, and the sweet aftertaste stands out.
Costa Rica Bach brewed flavor: smells like the fermented aroma of rice wine; on entry there is the sweet-and-sour quality of ripe tropical fruit and berries, accompanied by nutty and creamy flavors; the aftertaste carries caramel, and the finish has a faint floral note.
The above content is compiled by CoffeeHunters, a coffee news website.
