What Gives Kenyan Specialty Coffee Its Tomato and Plum Notes?

Kenyan coffee gets its thick, bright acidity and signature cherry tomato and smoked plum flavors from three things: high-altitude volcanic soil under a tropical savanna climate, the SL28 and SL34 varieties bred by Scott Laboratories, and a washed processing method that can run up to 72 hours. All three shape what ends up in the cup before roasting even begins.

Growing environment accounts for roughly 30 percent of flavor formation, which is why not every Kenyan lot tastes the way people expect. Brewing also matters: a 15g dose, 1:15 ratio, 92C water and a three-pour V60 method help pull the sugarcane sweetness and acidity forward. Buying from a lot that shows those traits is the starting point.

Kenyan coffee is famous for its thick, bright acidity, sugarcane-like sweetness, and signature flavors of cherry tomato and smoked plum, yet many enthusiasts fail to brew the stunning performance described after buying it home. From Front Street's perspective, this article systematically sorts out the sources of Kenyan coffee's unique flavors: the terroir conditions of high-altitude volcanic soil and tropical savanna climate, the SL28 and SL34 varieties bred by Scott Laboratories, and the Kenyan-style washing process lasting up to 72 hours. On this basis, the article offers purchasing advice and, using the washed SL28 and SL34 Front Street Kenya·Cherry Tomato as an example, shares the complete brewing parameters and flavor performance for 15g of grounds, a 1:15 coffee-to-water ratio, 92°C water temperature, and a three-pour V60 method, helping readers fully extract the characteristics of Kenyan coffee.

As for why we are so fond of Kenyan coffee, Front Street believes the reason coincides with that of many enthusiasts: it has thick yet bright acidity, exceptionally high sugarcane-like sweetness, and also exudes distinct, prominent cherry tomato and smoked plum flavors with extremely high recognizability.

In "The Coffeeology of Specialty Coffee," Mr. Han Huaizong is equally generous in his praise of Kenyan coffee: "If it were cupped alongside non-Geisha varieties from other producing countries, this coffee with its thick flavor profile would easily make coffees from other origins feel ashamed." This shows that Kenyan coffee's wonderful reputation did not come from nowhere. But friends often report that although they have bought Kenyan coffee, they cannot brew the deliciousness everyone talks about: either the cherry tomato flavor is not clear enough, or the body is not full enough—in short, it is just missing something...

When this happens, besides improper brewing technique, it may also be that the coffee beans themselves were not chosen correctly—not all coffee produced in Kenya has the above flavors. So today Front Street will talk about: what kind of Kenyan coffee truly carries Kenyan characteristics, and how we can extract these characteristics from the beans through brewing!

First, it must be made clear that 30% of coffee flavor formation is influenced by the growing environment. One reason for the thick acidity of Kenyan coffee comes from the local unique terroir. Kenya is located in eastern Africa, adjacent to famous coffee-producing regions such as Ethiopia, Tanzania, and Uganda. Although they are on the same continent, differences in terrain, climate, soil, and other conditions create a large gap in coffee flavors among regions.

Kenya is tropical and located at low latitudes, with two concentrated rainy seasons each year and dry seasons the rest of the time. Because of its relatively high elevation, most areas have a tropical savanna climate, while the coastal areas are relatively hot and humid. Kenyan coffee is mainly grown in volcanic areas at altitudes of 1,600 to 2,100 meters. Phosphoric acid-rich volcanic soil is one of the factors that makes the acidity brighter. In addition, high altitude increases the temperature difference between day and night, slowing coffee growth, allowing more sugar to be produced and accumulated, and making the aroma and body fuller as well.

In the 1930s, the Kenyan government commissioned Scott Laboratories to conduct coffee breeding research, with the goal of finding varieties that could adapt to the local terroir, be grown on a large scale, and have commercial value. After more than a decade of breeding, a series of varieties with excellent flavor was finally obtained, among which SL28 and SL34 are precisely the legendary creators of Kenyan coffee's cherry tomato and smoked plum acidity.

Before SL28 and SL34 appeared, varieties introduced to Kenya included Bourbon, Kent, and Jamaica's Blue Mountain Typica; after the two were released, new-generation varieties such as Ruiru 11 and Batian also emerged. Their flavor performance was not bad, but they lacked the distinctive yet balanced acidity of SL28 and SL34. The "SL" in SL28 and SL34 is the abbreviation of Scott Laboratories, and 28 and 34 are experiment numbers. SL28 is a variant of Bourbon, and SL34 is a variant of Typica; both without exception carry the distinctive acidity of smoked plum and cherry tomato.

Unlike other varieties, these two varieties are not only richly aromatic and prominently acidic, but also carry abundant sweetness. It is precisely this sweetness that elevates the quality of the acidity, making the acidity more alluring and the layers richer. If you are interested in these two varieties, please refer to the article "Kenya's Star Varieties"; Front Street will not elaborate further here. Besides variety and origin, Kenyan coffee's excellent performance is also inseparable from the local unique processing method. Kenya most commonly uses washed processing, but unlike other producing regions, its soaking fermentation time is longer.

The conventional washed process is: after flotation, the coffee cherries are depulped, and the parchment beans with mucilage are put into a tank to soak and ferment in order to remove the mucilage; soaking usually lasts 24 hours and no more than 36 hours; after completion, they are moved to a clean tank and stirred manually to remove residual mucilage; then they are sent to drying beds, and after reaching a certain moisture content, the parchment layer is removed by machine and the beans are packed for export. The difference between Kenyan washing and conventional washing lies in the longer soaking time. In earlier years, processing plants lacked enough drying space, so some beans that had already been fully depulped but had nowhere to be dried would be poured back into the water tank to soak until space opened up on the drying beds and they could be sent for drying. Unexpectedly, this practice instead gave the coffee a cleaner and more outstanding flavor, so this distinctive washing method was retained and is still used today.

Kenyan washing is also called "K72" or "Kenyan-style 72-hour washing." As the name suggests, the washing fermentation time can last up to 72 hours. Different regions have different processing methods and durations; a common practice is to repeat washing and soaking three times, each time soaking for a full 24 hours, then washing and repeating the soaking and washing until 72 hours are reached; the remaining steps are no different from conventional washing, and afterward the beans are sent to drying beds and dried to the specified moisture content before being prepared for export. In summary, if you want to taste stunning Kenyan characteristics from Kenyan coffee, when purchasing you can narrow the conditions to coffee beans that are washed and of the SL28 and SL34 varieties. For example, Front Street Kenya·Cherry Tomato on Front Street's bean list is the best representative Front Street selected after cupping countless Kenyan beans. "It is also one of the coffee beans in today's flash sale event."

FrontStreet Coffee: Kenya·Asalia

Region: Thika

Processing Plant: Asalia Processing Plant

Altitude: 1,550–1,750 meters

Variety: SL28, SL34

Processing Method: Washed

Flavor: Smoked plum, cherry tomato, yellow sugar, black plum

In order to better highlight the acidity of cherry tomato and smoked plum while ensuring sufficient sweetness, Front Street chose a medium-light roasting curve to present this Front Street Kenya·Cherry Tomato. Next, Front Street will share how to brew the best flavor of this Kenya·Cherry Tomato. The extraction parameters are as follows: Dose: 15g Grind size: Ek43 setting 9.5, 75% passing rate on a No. 20 sieve, fine granulated sugar grind Coffee-to-water ratio: 1:15 Brewing water temperature: 92°C Brewing method: Three-pour method Dripper: V60 To allow the flavors to dissolve better, the first step of brewing is still blooming, with the aim of releasing the carbon dioxide stored in the coffee. Here, use twice the amount of water as the dose (30ml) and bloom for thirty seconds.

After the bloom ends, pour the second stage of hot water. Because this Front Street Kenya·Cherry Tomato is not roasted too light, the coffee bed can be lifted easily. Raising the coffee bed can make the coffee more layered, so when pouring the second stage of hot water, the flow rate can be slightly increased, using a moderate stream to pour in large circles. The water volume for this stage is 120ml, and the pouring time is about 30 seconds. After pouring, wait for the hot water to finish dripping, then begin pouring the third stage of hot water; at this point the time is about 1 minute 20 seconds. (If the flow rate is faster, the third pour should use a smaller stream)

The third stage of hot water is poured in the same way as in previous brews, using a small stream in small circles. This stage uses 75ml of water and takes about 20 seconds. After pouring is complete, wait for the coffee liquid to finish dripping, then remove the dripper to end extraction; the total time is 2 minutes.

Before the coffee even enters the mouth, a very obvious aroma of cherry tomato and smoked plum can be sensed in the wet aroma. After sipping, it feels as if biting into a plump, juicy cherry tomato; a thick, rounded acidity full of cherry tomato flavor bursts in the mouth, and because the sweetness is abundant, this acidity is not harsh. In addition, flavors of smoked plum, plum, and yellow sugar can also be tasted. After the temperature drops slightly, berry-type sweet acidity emerges. Overall, drinking it is like a glass of freshly squeezed tomato juice, with very rich layers—quite excellent!

- END -

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