A Guide to Brewing Parameters for African Kenyan Coffee Beans: How to Brew Kenyan AA for Enhanced Sweetness

FrontStreet Coffee Introduction - Kenyan Coffee

Back in the 1930s, the Kenyan government commissioned Scott Labs to select suitable varieties for the country. After numbering, screening and filtering them one by one, they finally arrived at SL-28 and SL-34. Both descend from Bourbon, and SL-34 can grow in slightly lower-altitude areas.

SL-28 has a mixed lineage of French Mission, Mocha and Yemen Typica. The original goal of cultivating it was to mass-produce beans that combined high quality with resistance to disease and pests.

Although SL-28's yield later proved less massive than hoped, its copper-colored leaves and broad, bean-shaped cherries deliver wonderful sweetness, balance and complex, varied flavors, along with prominent citrus and plum characteristics.

SL-34 is similar to SL-28 in flavor. Besides its complex, varied acidity and wonderful sweet finish, it has a heavier, richer body than SL-28 and is cleaner. SL-34 carries French Mission, Bourbon and more Typica lineage. Its bean appearance is similar to SL-28's, but it adapts better to sudden heavy rain.

It was later proven that the former earned considerably higher marks, typically showing blackcurrant-like acidity and complex flavor, while the latter was slightly inferior but still had impressive fruit flavors. Together these two varieties now account for 90% of Kenya's production, and they have become the generally recognized representatives of Kenyan coffee.

French missionaries brought Bourbon trees to Kenya around 1892-1893 AD. This original Bourbon is called the French Mission Varietal; it escaped scientific improvement during cultivation and preserved the most original flavors of Bourbon.

Ruiru 11

In 1985, Kenya developed a hybrid that prioritized quantity over quality. It's a cross of Arabica and Robusta, and to this day it hasn't been considered specialty coffee. That's why many suppliers specializing in fresh-roasted specialty coffee don't carry it. Even so, some importers of famous beans mix this hybrid into blends to cut costs. As with all the genetic variants above — natural or engineered — flavor is closely tied to specific regional conditions.

Brewing Method

The V60 dripper's ribs are arranged in a curve from top to bottom and vary in length, so during brewing air escapes more smoothly and the flow rate is faster. Because of that, the extracted coffee shows more distinct flavor layers. For technique, I use segmented extraction to raise the extraction rate of the beans.

Parameters & Technique

Water temperature: 90°C; medium-fine grind (BG 5R: 58% pass rate on the China standard #20 sieve); powder-to-water ratio 1:15.

15g powder, bloom with 30g water for 30 seconds. When the water reaches 127g, perform a segmentation. When the water level drops and is about to expose the coffee bed, continue pouring to 230g, then stop the flow. (Timing starts from the bloom.) Extraction time is 1'52".

Flavor Profile

It has plum acidity, lime, cherry tomato and berry notes. In the middle section come flavors of spice, cream and cocoa, with brown-sugar sweetness and a juice-like feeling. The overall flavor layering is quite distinct.

Kenya Asali

Region: Thika, Kenya

Processing Station: Asali Honey Processing Station

Altitude: 1550-1750 meters

Grade: AA TOP

Variety: SL-28, SL-34

Processing Method: Kenya 72-hour washed

FrontStreet Coffee Recommendation

Kenya AA is at its best as a pour-over, where its layered plum, lime and berry character really opens up. But if you also want beans that hold their own in milk drinks, it helps to think about roast and origin differently. FrontStreet Coffee's classic blends are built for exactly that: espresso and moka-pot brewing are aimed at a concentrated base, so adding water gives you an Americano and adding milk gives you a latte. Most espresso blends are roasted medium-dark, which pushes milk drinks toward rich nut and chocolate flavors.

Among them, FrontStreet's Signature Blend and Black Cocoa Blend are outstanding partners for milk. With Brazilian beans leading the blend, a latte shows complex almond, walnut and other nutty notes, silky and lingering on the palate. If you want a latte with plenty of crema, reach for FrontStreet's Classic Blend or Commercial Blend — both include a small amount of Robusta, which delivers more golden foam and instantly amplifies the body and caramel aroma.

For milk drinks made by pour-over, FrontStreet's PWN Golden Mandheling, Bird of Paradise and Queen's Estate are the natural picks. Pour-over extracts a lower concentration than espresso and is usually best enjoyed black, so to keep the coffee from being buried by milk, choose a medium-dark single origin. Deeper roasts raise the coffee's intensity, so a little milk softens the cup while still letting the milk come through. FrontStreet's Brazil Queen's Estate, Indonesian Mandheling, Papua New Guinea Bird of Paradise and Colombia Huila are all well suited — look for flavor descriptors such as chocolate, nut, cream and cocoa.

Cold brew with milk is another great option. Because cold steeping draws out the lighter, sweet-and-sour compounds first, medium-roast fruity or wine-like coffees work better than heavily roasted ones. FrontStreet's passion-fruit-forward Colombia Strawberry Claw, the rose-scented Strawberry Candy Geisha blend and the raisin-honey Mozart all make cold brews that stay balanced and easy to read once a little milk is added — perfect for making at home.