Tanzanian Peaberry coffee is a blend of peaberries from smallholder farmers from various villages and washing stations in Tanzania’s southern highlands. Most farmers in this region grow a few different cultivars, including N 39 and KP 423, two Tanzania-specific varieties. The way this lot was created was by sorting out the peaberries from 4–5 different washing stations to create a full lot of peaberries as opposed to the usual mixed lots.
Farmers in this region typically harvest coffee in the morning and deliver their cherries in the afternoon, starting at around 3pm. The depulpers get turned on pretty soon after that, with lots being depulped and prepared for fermentation from 3:30pm all the way to midnight. The coffees are graded after being depulped and are separated into different channels, where they will head to tanks to soak for 10–12 hours. They are washed clean of mucilage and then spread to dry for 9–14 days.
With its relatively close proximity to Ethiopia, and its shared border with Kenya, some of Tanzania’s population has had a long history and culture relationship with coffee, namely the Haya people, for whom the plant was not used so much as a beverage as a chewed fruit. Coffee (probably Robusta) was grown for this domestic purpose until German colonists essentially mandated that farmers grow Arabica coffee as a cash crop, spreading the plants’ reach within the country and developing the industry around Mount Kilimanjaro.
Germany lost control of the colony to the British after the First World War, and the British attempted to develop a more efficient and profitable coffee industry along the lines of Kenya’s. Cooperatives of smallholder farmers started to organize in the 1920s to try to improve market access, but it was many years before Tanzanian Peaberry coffees really caught on internationally.
In 1964, after both countries achieved independence from Britain, Tanganyika and Zanzibar were combined to establish the Republic of Tanzania—hence the country’s name, Tan/Zania. Growers attempted aggressive growth in the 1970s but had difficulty increasing production. The 1990s saw efforts to reform and privatize coffee exports, allowing growers to sell more directly. Today, in most of the Western world, Tanzanian coffees are famous primarily as separated-out peaberry lots.
Peaberries are a naturally occurring mutation of the coffee seed that forms a single, small, rounder unit than the two “flat beans” that typically sit face-to-face inside a coffee cherry. While somewhere between 5–12 percent of any yield can be expected to naturally develop peaberries, some coffee varieties and origins tend to see higher occurrence of them, while in others they are uniformly sorted out of each lot in order to maintain screen-size uniformity.
In the case of Tanzania, the majority of the coffee exported is bought by Japanese roasters, who prize bean-size uniformity and see peaberries as being an undesirable defect. For this reason, the peaberries are often unsold to the Japanese market, and are the majority of what is available to Western buyers. Some swear by peaberries having a degree of flavor potency that normal flat beans lack, and others can’t tell the difference. They do tend to be slightly pricier on account of both their more limited quantity (since peaberries occur in a smaller percentage of coffee overall) and the labor involved in sorting them out
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