How Does Coffee Process Change Yirgacheffe Flavor?

Yirgacheffe coffee tastes markedly different depending on the coffee process used. Natural processing dries whole cherries, retaining pulp sugars through full fermentation, which yields tropical fruit and winey aromas. Washed processing removes the fruit first, so the cup leans toward bright citrus and lemon acidity with white floral notes.

Two lots from Front Street illustrate the gap: the Guddina Cooperative is washed, while Red Cherry is natural. Comparing processing, cupping performance and V60 pour-over parameters shows how each method steers flavor direction and offers reusable brewing suggestions. Unlike purple bean coffee, which gets its color from a different process, Ethiopia's high altitude, low rainfall and abundant sunshine make the region well suited to natural drying.

Yirgacheffe, as a representative producing region of Ethiopian specialty coffee, presents completely different flavors depending on whether it is processed naturally or washed. The natural method retains the sugar in the fruit pulp, allowing full fermentation, which brings rich tropical fruit and winey aromas; the washed method highlights the bright acidity of citrus and lemon along with white floral notes. Front Street Coffee takes the washed lot from the Guddina Cooperative and the natural Red Cherry lot as examples, comparing processing methods, cupping performance, and V60 pour-over parameters one by one, helping coffee lovers understand the specific impact of the two processing methods on flavor direction and providing reusable brewing suggestions.

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When selecting coffee beans, besides paying attention to origin and flavor description, the processing method is also an important consideration. Different processing techniques give coffee beans completely different flavor directions. Even beans from the same producing region will show very different taste performance after being washed or naturally processed. Take the Ethiopian Yirgacheffe on Front Street's bean list as an example: the Guddina Cooperative is a washed lot, while Red Cherry is a natural lot. Now let's take a specific look at the differences between these two beans.

Naturally processed Yirgacheffe coffee

The natural method is carried out by directly drying mature coffee cherries after harvest. During this process, the sugars and aromatic substances contained in the fruit pulp are fully retained and gradually penetrate into the green beans. The longer the drying time, the deeper the fermentation. Because the coffee fruit completes drying in a natural state, the beans mature inside the parchment with less external interference, so naturally processed beans often further amplify their own flavors, presenting distinct tropical fruit notes, intense fermentation character, and prominent sweetness.

From the perspective of traditional conditions, Ethiopia's high altitude, low rainfall, and abundant sunshine make it very suitable for natural processing. But in the early days, farmers spread coffee beans directly on mud ground or rooftops to dry them. The fruit was prone to picking up earthy notes, or over-fermenting due to uneven heating, ultimately leading to a decline in coffee quality.

In order to improve the income of local Ethiopian farmers and enhance coffee quality, the Dutch trading company Trabocca BV launched the "Operation Cherry Red Project" in 2007. This project mainly targeted high-altitude producing regions such as Yirgacheffe, improved processing techniques such as washed, semi-washed, and natural, and introduced professional cuppers to participate. During the harvest season, corresponding harvest volumes were set according to different microclimatic regions, picking only 100% ripe red coffee cherries, with production generally controlled at about 1,500-3,000 kilograms. The financial loan support, new hardware equipment, and production technical knowledge provided by Trabocca significantly improved coffee quality in the Yirgacheffe producing region and even throughout Ethiopia. Coffee prices also rose accordingly, and coffee farmers' incomes increased as a result.

Compared with the past, today's natural processing invests more effort in manual sorting and uniform drying. Freshly picked red coffee cherries first undergo manual sorting to remove defective beans, overripe beans, and insect-damaged beans, retaining high-quality fruit. They are then sent to drying sites for processing. Different producing regions use different drying facilities; some use tarps, some use raised beds, and the most common is the African drying bed. The drying process usually lasts 27 to 30 days, and is only considered complete when the coffee fruit turns dark purple and the moisture content drops to 11%. Natural Yirgacheffe tastes more intense and has richer layering, with winey fermented notes and relatively higher sweetness.

Washed Yirgacheffe coffee

Ethiopia's washed technique was introduced from Central and South America in 1972. The washed processing flow is complex and tedious and requires a large amount of clean water, so its cost is higher than the natural method, and it is also relatively less used in water-scarce African regions.

Washed steps: after the coffee cherries are picked, they are placed in water, and underripe fruits are removed by buoyancy. Then the skin and pulp are removed with a pulper, and the beans are left to rest in fermentation tanks for 18 to 36 hours until the mucilage layer decomposes. After fermentation ends, parchment beans are scrubbed in channels for 30 to 60 minutes. Through specially designed channels combined with water flow, low-density and poor-quality beans are separated out, and then the high-quality coffee beans are drained and spread on African raised beds for drying.

Because the fruit pulp has already been removed before drying, Yirgacheffe's own inherent aromas are displayed more clearly and thoroughly, presenting citrus and lemon notes and elegant white floral notes, with an overall bright and delicate flavor. After launching washed coffee beans, Yirgacheffe leapt to become a representative specialty coffee producing region in the world.

Flavor differences in cupping

In terms of roasting, Front Street considers that Yirgacheffe should take acidity as its main flavor direction, so it uses medium-light roasting. The washed Yirgacheffe Guddina Cooperative coffee beans use light roasting to retain more bright acidity and floral notes; the natural Yirgacheffe Red Cherry coffee beans use medium-light roasting to present full berry sweetness and acidity. Every time Front Street launches a coffee bean, it conducts at least one cupping evaluation. Under the same standards, cupping allows us to feel the strengths and weaknesses of the coffee more objectively.

Cupping flavor of washed Guddina Cooperative coffee : The dry fragrance gives off fresh passion fruit, citrus, and berry acidity. The wet aroma is citrus and berries. On the palate, there is citrus acidity, berry sweetness, almond, and tea-like notes, with a honeyed sweetness in the finish. The body is low, the acidity is bright, and it is clean and refreshing.

Cupping flavor of natural Red Cherry coffee : The dry fragrance shows full berry sweetness and acidity. When slurped at different temperatures, there are soft berry sweetness and acidity, ripe fruit fermentation character, obvious honey sweetness, and a black tea finish, with a smooth mouthfeel.

Through comparison, Front Street tasted that both the natural and washed Yirgacheffe carry citrus and berry acidity. The washed version has higher acidity and a brighter, more uplifting mouthfeel, with a finish mainly of honey aroma; while the natural version highlights the roundness of tropical fruit, a creamy and smooth mouthfeel, and a stronger fermentation character.

Pour-over recommendations to share

Many friends consult Front Street about related brewing suggestions after purchasing coffee beans. In fact, Front Street puts brewing references on the label of every bag of coffee beans. Here, Front Street takes the washed Guddina Cooperative as an example and explains Front Street's extraction approach according to the store's production standards.

Because Yirgacheffe coffee beans grow at high altitude and are relatively hard in texture, in order to bring out more floral and fruity notes in the coffee, Front Street uses hot water at 92°C-93°C for extraction. For grind size, Front Street recommends medium-fine grinding (78% passing through a Chinese standard No. 20 sieve). Too coarse and it cannot extract rich substances, making the brewed coffee seem thin. Too fine and it is easy to over-extract at high water temperature, making the brewed coffee prone to bitterness.

During cupping, Front Street noticed that this bean shows different flavors at different temperatures, so the brewing method uses three-stage extraction, allowing different flavor substances to show their best selves as the coffee bed rises in temperature in stages. In order to highlight the fresh and charming aroma of washed Yirgacheffe, Front Street uses a V60 dripper for brewing.

Compared with other drippers, the conical shape and 60° angle design mean that when brewing with a V60, the water flow must reach the center before dripping into the server, extending the contact area between water and coffee grounds so that aroma and flavor can be fully extracted. Its iconic single large hole allows the water flow to proceed without obstruction. The liquid flow rate largely depends on the brewer's flow control ability and is directly reflected in the coffee flavor. If your pouring habit is relatively large or fast, the delicious substances may not yet have been released from the coffee before extraction is already over, so the brewed coffee will very likely taste thin and bland.

Not only that, the side wall of the V60 dripper has multiple raised spiral ribs, some long and some short, running through the entire dripper. First, they prevent the filter paper from fitting tightly against the dripper, forming enough space for air circulation and maximizing the coffee particles' water absorption and expansion; second, the spiral protruding groove design also causes the washing and falling water flow to press the coffee bed, forming richer layering, while also extending the water flow path and avoiding under-extraction caused by the large hole.

In terms of brewing ratio, Front Street believes 1:15 to 1:16 is acceptable. If you want a richer mouthfeel, use 1:15; if you want to feel the floral sweetness more clearly, you can use 1:16 to let the flavors spread out more.

Dripper: V60 Water temperature: 92-93°C Dose: 15g Coffee-to-water ratio: 1:15 Grind size: fine granulated sugar size (78% of grounds passing through a No. 20 sieve)

Three-stage pouring: wet the coffee bed with twice the amount of water as coffee grounds, forming a dome and blooming for 30s, then pour in a small stream in circles from the inside out until 125g, then pause. When the coffee bed drops to half the height of the dripper, continue pouring the third stage with the same fine stream until 225g, until all the coffee liquid has filtered through, then remove the dripper. The time is about 2 minutes. After the coffee in the dripper flows into the server, remove the dripper, then shake the coffee liquid in the server evenly, and you can begin tasting Yirgacheffe's flavor starting from high temperature.

Flavor description of pour-over washed Yirgacheffe

After the washed Yirgacheffe coffee beans are ground into powder, you can smell the fresh fragrance of honey and jasmine. When Front Street pours in hot water, a trace of berry flavor begins to emerge. The pour-over black coffee enters the mouth with bright lemon, citrus, and green tea, and as the temperature changes, there are berry, cream, and sugarcane notes in the finish. The sweet aftertaste is obvious, and the mouthfeel is clean and sweet.

The above content is compiled by CoffeeHunters, a coffee news website.