What makes Kenya coffee PB round beans distinctive?

Kenya PB is the peaberry grade: a single rounded bean that forms when only one seed develops inside the coffee cherry instead of the usual two. Kenyan coffee grows at roughly 1,500 to 2,100 meters, where daytime highs of 22 to 26°C and nighttime lows of 10 to 14°C slow ripening and let the fruit accumulate more flavor compounds.

The main varieties are SL28 and SL34, and the country's grading system sorts lots by bean size and quality. Coffee bean processing often follows the K72 washed method used at estates such as Thunguri, a 72-hour fermentation that supports the berry acidity and caramel finish typical of Kenyan coffee. Coffee reached Kenya in 1893 from Réunion Island.

Although Kenya is not the birthplace of coffee, it has turned coffee into a pillar of its national economy thanks to high altitudes, fertile soil, and a rigorous scientific research system. This article focuses on Kenya PB peaberry, a unique variant, sorting out its growing geography, variety origins (SL28 and SL34), and grading system, while also introducing in depth the K72 washed processing method of the Thunguri Estate. The pour-over parameters and three-stage brewing method recommended by Front Street Coffee will also be shared, so you can experience the full-bodied berry acidity and caramel finish of Kenyan coffee.

In Front Street's view, Kenya's investment and dedication in the coffee industry are truly admirable. Although it is a famous coffee-producing country in Africa, coffee cultivation started much later there than in neighboring Ethiopia. Yet through continuous effort, Kenya has managed to make coffee an important pillar of its national economy, which in itself is remarkable. Today we will talk about Kenyan coffee.

Kenyan Coffee Growing Geography

Kenya is located in East Africa, with the equator passing through its center. The country has high-altitude terrain and a tropical savanna climate, with abundant rainfall and soil rich in minerals, providing ideal growing conditions for coffee trees. It is especially worth noting that in some parts of Kenya, the soil's phosphorus content is relatively high, which gives the coffee beans more pronounced acidity.

Kenyan coffee beans are grown at an average altitude of between 1,500 and 2,100 meters. The producing regions have a marked temperature difference between day and night, with daytime highs of about 22 to 26°C and nighttime lows dropping to 10 to 14°C. This alternating warm and cool environment slows the ripening pace of the coffee fruit and also gives the fruit more time to accumulate flavor compounds.

Kenyan Coffee Cultivation

Coffee cultivation in Kenya can be traced back to 1893, when it was first introduced from Réunion Island. At that time, coffee agriculture was firmly controlled by the British colonial authorities and officials. It was not until 1935 that local Kenyans began to gain autonomous management rights. Before that, the local population had long labored for the British in a manner akin to slavery. Early Kenyan plantings were of the Bourbon variety, and after 1935 people turned to cultivating SL28 and SL34, developed by the Scott Laboratories. These two varieties are easy to cultivate, have larger beans and higher yields, and also perform quite well in flavor.

SL28 and SL34 Coffee Varieties

SL28 first appeared in the 1930s. At that time, the Kenyan government commissioned the newly established Scott Labs to screen suitable varieties nationwide. Forty-two initially selected varieties were numbered one by one and eliminated until SL-28 and SL-34 remained. SL28 comes from Bourbon, while SL-34 comes from Typica; the two are not from the same series. The original purpose of breeding SL28 was to obtain coffee beans that were both high-yielding and high-quality and resistant to pests and diseases, but in some producing regions the breeding goals mainly favored high yield and disease resistance, and disease resistance was not taken into consideration.

Thanks to its Bourbon genes, although SL28 later fell short of expected yields, its bronze leaf color and broad-bean-shaped beans brought excellent sweetness, balance, and complex, varied flavors, with obvious citrus and smoked plum characteristics. SL34 is close to SL28 in flavor and likewise has complex, varied acidity and a pleasant sweet finish, but its mouthfeel is softer and cleaner than SL28. SL34's lineage blends French missionary, Bourbon, and more Typica components. Its bean appearance is similar to SL28, and it is better able to adapt to rainforest environments.

The Differences Between the Most Common Kenyan Coffee Grades

Kenyan coffee is graded through specific screens, with grade determined by the size of the coffee fruit. The AA grade requires all coffee beans to reach 17 to 18 mesh. The Kenyan Asali Processing Station washed coffee beans sold by FrontStreet Coffee are of AA grade, plump and uniform. The AB grade means the coffee size is 15 to 16 mesh, allowing 10% below 15 mesh, but there is no inevitable direct connection between grade and actual quality.

The Kenya Coffee Board is extremely strict about coffee research and development and quality management, and through an excellent auction system it drives up coffee bean prices, indirectly helping hardworking coffee farmers. At the same time, with the help of agricultural education, coffee farmers' cultivation techniques are constantly updated, enabling them to produce higher-quality coffee. High-quality Kenyan coffee with a particularly strong blackberry fruit acidity is scarce in quantity, and these beans are often acquired by green coffee buyers through bidding, coming from excellent coffee estates.

What Are Kenyan PB Coffee Beans?

Coffee beans usually consist of two pea-like parts (commonly called female beans), while PB peaberries are long rice-shaped or oval (commonly called male beans). Kenyan peaberries are a variant of Kenyan beans, selected by hand, and among the many coffee PB peaberries they have the most distinctive character. The Kenyan coffee beans sold by FrontStreet Coffee come from the Thunguri Estate.

Kenyan Coffee Bean Processing Methods

Both Kenyan coffee beans sold by Front Street use the Kenyan 72-hour washed processing method. Unlike ordinary washing methods, Kenyan coffee beans need to undergo 72 hours of fermentation, making the acidity fuller and more solid. After the coffee is harvested, the highest-quality fruit is first selected, then depulped and fermented for 24 hours, after which it is rinsed with clean river water.

Next, it is fermented again with clean river water for 24 hours, then washed again, repeating this cycle 3 times for a total of 72 hours, hence the name Kenyan-style 72-hour fermentation washed processing method, or K72 for short. Front Street believes that the K72 processing method allows the coffee beans to ferment for a long time at low temperatures, making the acidity brighter while retaining a clean, full-bodied flavor.

How should such high-acidity Kenyan coffee beans be brewed to taste good?

The unique coffee varieties, the environmental characteristics of the growing regions, and the distinctive Kenyan 72-hour washed processing method together create an excellent coffee flavor for Kenyan coffee beans. Front Street recommends using pour-over brewing, which is what we commonly call hand brewing, to extract the coffee.

Dripper: harioV60, grind size: medium-fine grind (75% passing rate on China standard No. 20 sieve), coffee dose 15g, brewing coffee-to-water ratio 1:15, brewing water temperature 91°C.

Front Street recommends a three-stage brewing method: in the first stage, pour 30 grams of water to bloom for 30 seconds; in the second stage, pour 95 grams of water (electronic scale shows 125 grams), finishing at about 1 minute; in the third stage, pour 100 grams of water (electronic scale shows 225 grams), finishing at about 1 minute 45 seconds, with a total extraction time of 2 to 2 minutes 10 seconds. Remove the dripper and shake evenly before starting to taste.

Brewed flavor of Kenyan coffee beans: whether AA-grade coffee beans or PB peaberries, the coffee has a very full-bodied berry acidity, resembling both tomato juice and mixed fruit juice, and the finish also brings a caramel-like sweetness ~ the flavor layers are obvious when drinking, and the acidity is bright and clean!

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