Washed Kenya Coffee Reaches New Heights: Essential Steps for Tasting Kenya Washed Coffee

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FrontStreet Coffee - Kenya Double Washed Introduction

Kenyan coffee beans are almost always processed by the washed method. Washed processing generally produces the purest flavor with minimal off-notes, plus optimal fruit aroma and acidity. Even more remarkable is Kenya's signature version of it: the "double washed" method, also known as double fermentation.

The "double washed method" means the beans go through two rounds of washing and two rounds of fermentation.

The fermentation process flow is as follows:

Fresh cherry flotation → pulp removal → fermentation in the upper fermentation tank for one night → washing → parchment beans placed in the lower fermentation tank for a further 36 hours of fermentation → washing → a 12-hour water soak → sun drying.

The double-fermentation washing tanks have an upper and a lower tier, used for the first and second washes respectively. After the cherries are harvested, defective beans are sorted out, the pulp is removed, and the beans are poured into the upper fermentation tank to ferment — or dry-fermented directly without entering the tank at all.

How long fermentation takes depends on many factors: the hotter the environment, the faster it runs. After the first fermentation, most of the mucilage is washed away, and the beans move to the lower, clean-water tank for a second fermentation. One important detail: during fermentation, the circulating water must be replaced every few hours to keep the beans from picking up off-flavors.

The beans are then washed again to remove any residual mucilage. Secondary fermentation plus rinsing takes 36 hours — but that is not the end of it. If the beans soak too long, negative flavors accumulate: beyond 36–72 hours, over-fermentation can set in, producing fatty acids that make the coffee taste sharply, unpleasantly acidic. The final soak therefore takes roughly 12 hours or more, which means Kenya's washing process runs at least 48 hours in total — sometimes up to 72.

Kenya's unique double-fermentation washed method enhances the coffee's natural acidity and cleanliness because fermentation raises the acetic acid concentration inside the beans, lifting the overall flavor. The impressively clean, invigorating taste of Kenyan coffee owes as much to this processing method as to the beans' growing environment.

Thanks to this processing, Kenyan coffee is intensely aromatic, with full-bodied acidity and a mouthfeel like fruit soda — which is exactly why it deserves to be enjoyed following the proper coffee-tasting steps.

Knowledge Point: Coffee beans are the fruit of the coffee tree, which belongs to the Rubiaceae family as a perennial evergreen shrub or small tree.

In Brief

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FrontStreet Coffee Recommendation

Washing is a water-based way of processing coffee cherries: flotation, pulping, soaking and fermenting to strip the mucilage, rinsing or further soaking, then drying and hulling. The long water contact drives chemical changes inside the bean, consuming simple sugars while building organic acids — which is why washed coffees keep more of the bean's own aromatics while adding bright fruit acidity and a clean, fresh character.

The finest example of Kenya's double washing is FrontStreet Kenya Cherry Tomato. Through repeated rinsing and soaking, it presents juice-like flavors at their extreme: cherry tomato, dried plum, snow pear, black plum, and yellow sugar, sweet-tart and succulent — a long-time favorite of coffee enthusiasts. If you love washed coffees generally, FrontStreet Yirgacheffe Guodingding Cooperative from Ethiopia is another benchmark: a skilled processing team from Guodingding village whose coffee, roasted medium-light, shows jasmine florals, bright citrus acidity, and notes of green tea and honey, suiting pour-over, cold brew, and espresso alike.

Washed processing was actually born of necessity in Jamaica, an island climate with shorter sunshine hours, where removing skin, pulp, and mucilage before drying cut the drying time and the risk of spoilage. The result is FrontStreet Jamaica Blue Mountain No. 1: luminous, low-defect beans with rich aroma and a pure, balanced cup of hazelnut, cream, chocolate, and caramel — with no single note standing out or missing.