How does coffee processing shape the flavor in the cup?

Washed and natural are two distinct paths in coffee processing. Washed coffee is depulped first, then fermented, and the pectin is rinsed off with water, producing a clean, bright acidity with citrus and lemon tones. Natural coffee dries with the fruit pulp still attached under continuous sun, giving a richer and fuller flavor.

The washed route can also use dry fermentation, skipping the soaking step and washing off pectin after fermentation, followed by sun or machine drying to prevent mold. A 2001 study linked the higher acidity of washed beans to pH and organic acid changes. Front Street Coffee offers both styles, including Front Street Jamaica Blue Mountain, Front Street Kenya and Front Street Washed Yirgacheffe, each with its own brewing parameters.

Washed and natural are two completely different paths in coffee post-processing. The former centers on fermenting after removing the fruit pulp and then washing, while the latter dries the beans directly with the fruit pulp still attached. The washed method decomposes pectin through soaking and fermentation during processing, ultimately presenting a clean, bright acidity with citrus and lemon tones; the natural method relies on continuous sunlight, resulting in a richer, fuller flavor. Each method has its own processing advantages and limitations, and directly shapes the direction of the flavor in the cup. A 2001 study confirmed the cause of the higher acidity in washed beans from the perspective of pH value and organic acid changes. Under Front Street Coffee, there is both the balanced and full-bodied "Front Street Jamaica Blue Mountain," and the brightly elevated "Front Street Kenya" and "Front Street Washed Yirgacheffe," with brewing parameters varying by bean.

Washed Method

The core steps of this processing method are: the coffee fruit is first depulped, then fermented, and after fermentation is complete, the pectin is rinsed off with water. In specific operations, after the coffee cherries are picked, unripe fruits and mixed leaves and twigs are first removed, then the fruit skin is removed to extract the beans, followed by washing and soaking to bring the beans into a fermentation state, using microorganisms and enzymes to decompose components within the beans, thereby forming flavor substances such as acidity.

Washed

The washed method can also adopt dry fermentation, that is, without the soaking step, and after fermentation is complete, the pectin is washed off with water. After fermentation, the beans still need to be sun-dried or machine-dried to prevent mold. Properly processed washed coffee beans usually have a milder flavor, and depending on environmental conditions and the degree of fermentation, they may also carry a vinous note.

After processing is complete, defective beans are first removed and intact beans are retained, then subjected to different roast levels, ultimately revealing ever-changing flavors and mouthfeels. From green bean production to the completion of brewing a cup of coffee, subtle differences in every step in between will affect the quality and flavor of the coffee. This is precisely why the coffee world is so profound, fascinating, and immersive.

The most labor-intensive processing method — natural is dried with the fruit pulp, while the principle of washed is to remove the pulp and dry

Process: Pick coffee cherries ⇒ throw into water to first remove impurities (stones, twigs, defective beans) ⇒ then put into the depulper ⇒ soak for 12——36 hours to soften the mucilage layer on the beans so they can be rinsed ⇒ enter the fermentation tank (mucilage is decomposed) ⇒ rinse ⇒ coffee beans with parchment are directly dried.

Washed

The quality of washed beans is generally better than that of natural beans (though not absolute). Natural beans often surpass washed beans in aroma and body, but washed flavors are exceptionally clean with bright acidity. The acidity here differs from that of natural; the acidity of washed coffee is usually close to citrus and lemon, unlike the ripe-fruit aroma presented by natural, but there is also a risk of over-fermentation.

A 2001 study explored the fermentation changes of washed coffee beans and found that the pH value of coffee beans before fermentation was about 5.7, and after 20 hours of fermentation it dropped to 3.8. Their sugar content decreased significantly, while the corresponding organic acid content increased substantially, showing that washed coffee beans indeed contain more acidic substances that make their flavor more acidic.

Natural and washed each have processing advantages and disadvantages. The natural processing method is simple; it only requires using sunlight to dry the coffee fruit. However, because it relies heavily on continuous strong sunlight for several weeks, it is instead limited by weather. If it rains for several of those days, the entire batch of coffee fruit may be ruined. Therefore, good natural beans instead command persistently high prices at coffee bean auctions. Washed coffee also has processing limitations. In some countries with water shortages or poor water quality, the washed method may not be usable.

Front Street Coffee has quite a few washed-process beans, such as "Front Street Jamaica Blue Mountain," "Front Street Kenya," "Front Street Washed Yirgacheffe," and so on. What is different, however, is that although "Front Street Jamaica Blue Mountain" is washed , it is very balanced and has a full-bodied mouthfeel, while the acidity of "Front Street Kenya" and "Front Street Washed Yirgacheffe" is very bright. Therefore, Front Street Coffee recommends a brewing water temperature of 88°C and a time of 1 minute 50 seconds for "Front Street Jamaica Blue Mountain"; while for "Front Street Kenya" and "Front Street Washed Yirgacheffe," brew at 90-91°C for about 2 minutes 10 seconds.

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