Kenya AA Washed - Green Coffee Beans

Kenya AA beans are large, dense, and high in moisture relative to most African greens. The AA screen size means uniform bean density across the lot, which produces even roasting — but the density requires more heat energy and slightly longer time to first crack than Ethiopian or Colombian greens at comparable altitudes. Use a moderate charge temperature, allow a thorough drying phase, and give the Maillard stage enough time to develop sweetness before first crack. The black currant and berry character is most vivid at light and medium roast. Allow the brewed cup to cool — Kenya AA evolves significantly as temperature drops, revealing complexity that is not apparent when tasted hot.

Medium-dark and dark roast are not recommended for this lot. The vibrant acidity, floral character, and hibiscus finish that make Kenya AA one of the most prized origins in specialty coffee are progressively lost beyond medium roast development. This green coffee earns its SCA 85 score at lighter roast levels.

Kenya has built one of the most sophisticated coffee grading and auction systems in the world. The Kenya Coffee Auction, managed by the Nairobi Coffee Exchange, grades and trades coffee through a competitive bidding system that incentivises quality at the farm level — farmers and cooperative societies receive premium prices for higher-scoring lots, which drives consistent investment in processing quality. AA is the largest screen size grade in the Kenyan system, indicating beans that pass through an 18/64-inch screen, producing the large, dense beans that roast with intensity and hold their aromatic complexity through development better than smaller-graded Kenyan lots.

The four varieties in this lot each contribute distinct qualities. SL-28 and SL-34 are the foundational Kenyan varieties — selected in the 1930s by Scott Laboratories from drought-resistant local lines — responsible for the intense black currant acidity and full body that define classic Kenyan specialty coffee. Batian is a more recent variety released by the Coffee Research Institute of Kenya in 2010, bred for disease resistance while retaining the high cup quality of the SL lines. Ruiru 11 is the compact, high-yield variety developed in the 1980s for disease resistance and productivity in smaller farm plots. Together they produce a lot with the structural integrity of the SL varieties and the productive consistency of the newer lines.

Washed processing at Kenyan washing stations involves a double-fermentation process unique to the country — cherries are pulped, fermented, washed, soaked in clean water overnight, and then dried on raised beds. This extended processing protocol produces the exceptional cup clarity that makes Kenyan coffee distinctive among African origins, allowing the varietal character and terroir to come through with a precision that natural processing cannot replicate.

What does Kenya AA grade mean?

AA is Kenya's largest screen size grade, indicating beans that pass through an 18/64-inch screen. It is not a cup quality grade — it refers to physical bean size. Larger beans are denser, absorb heat more evenly during roasting, and tend to produce more intense, complex cups than smaller-screened Kenyan grades like AB or C. AA commands a premium in the Kenyan auction system because of the consistent roasting quality and cup intensity associated with larger bean sizes. An SCA score of 85 on this lot confirms the cup quality independently of the grade designation.

Why is Kenya SL-28 so highly regarded in specialty coffee?

SL-28 was selected in the 1930s by Scott Laboratories from a drought-resistant local Kenyan line. It produces the intense black currant acidity and full body that have made Kenyan specialty coffee famous worldwide. No other variety anywhere in the world produces the same black currant character that SL-28 delivers when grown at high altitude in Kenyan volcanic soil. It is difficult to grow — susceptible to coffee berry disease and coffee leaf rust — but the cup quality it produces is unmatched. The presence of SL-28 and SL-34 in this Kenya AA lot is a primary reason the profile is as distinctive and complex as it is.

Why should I let Kenya AA cool before tasting?

Kenya AA has an unusually high concentration of citric and phosphoric acids that behave differently at different temperatures. At very hot brewing temperature the acidity can feel sharp and the black currant character is partially masked. As the cup cools toward 50 to 60 degrees Celsius the acidity softens into a wine-like complexity, the black currant and hibiscus notes become more defined, and the full body becomes more apparent. Tasting a Kenya AA at different temperatures across a single cup session is one of the most educational sensory experiences in specialty coffee home roasting.

How should I store this green coffee?

Store in a cool, dry place away from direct light and moisture. Green coffee is stable for 12 to 18 months in correct storage conditions. We ship all our green coffee in 9 layer hermetic Ecotact bags to preserve moisture content and the aromatic character of this lot between roasting sessions.