Variety · Kenya
SL28 was selected in Kenya in the 1930s for drought tolerance and gave Kenyan coffee its famous blackcurrant acidity. Why it rarely tastes the same elsewhere.
SL28 was selected in the 1930s by Scott Agricultural Laboratories in Kenya, from material with Bourbon lineage, and it is one of the most successful quality selections ever made.
Drought tolerance, primarily — Kenya needed varieties that could survive dry periods. Cup quality was a secondary criterion that turned out to be the enduring one.
SL28 is responsible for the acidity Kenya is famous for: blackcurrant, grapefruit, tomato, with a juicy, mouth-watering quality and a syrupy body underneath.
It is intense and immediately recognizable, and it is the reason people who love Kenyan coffee love it specifically.
SL28 has been planted in Colombia, Panama, Ecuador and elsewhere, usually with encouraging but less dramatic results. It keeps some character and rarely reaches Kenyan intensity.
That suggests the variety is necessary but not sufficient — Kenya’s volcanic soil, unusually high in phosphoric acid, and its distinctive double-fermentation washing process are doing part of the work.
Low yield and high susceptibility to coffee leaf rust and coffee berry disease. Kenya has bred resistant alternatives — Ruiru 11 and Batian — which yield better and are widely accepted as cupping less distinctively.
Many Kenyan lots now mix SL28, SL34, Ruiru 11 and Batian, and bags specifying SL28 and SL34 command a premium.
Filter, light roast, a clean brewer that shows acidity. Grind finer than usual and brew hot — these are dense beans and under-extraction makes the acidity sour rather than bright, which is the commonest mistake with Kenyan coffee.
It is the largest single factor, alongside volcanic soil high in phosphoric acid and Kenya’s distinctive double-fermentation washing. Grown elsewhere, SL28 keeps some of the character but rarely reaches Kenyan intensity.
A sibling selection from the same program, Typica-related rather than Bourbon-related. It tolerates rain better and is usually described as slightly less intense. Kenyan lots often contain both.
The equipment this actually requires — not a shopping list, the shortest route to doing it properly.
60° cone · spiral ribs · 1–4 cups
The most transparent cup you can brew for twenty dollars, and the least forgiving. Ceramic holds heat where plastic does not — and the open bottom means your pour, not the dripper, decides the coffee.
Best for: Someone who wants to taste what a single-origin coffee is actually doing.
64 mm (2.52 in) flat burr · filter only · single dose
64 mm (2.52 in) flat burrs, near-zero retention and a footprint the size of a mug, built for filter and honest about not doing espresso. For pour-over it is the clearest grind you can buy at this price.
Best for: V60, Chemex, AeroPress and batch brewing, where clarity is the whole point.
0.9 L · ±1 °C (±1.8 °F) hold · counterbalanced gooseneck
The best-pouring kettle sold, and the hold function matters more than the thermometer. Expensive for boiling water — but if you brew pour-over daily, it is the accessory that most improves the cup.
Best for: Daily pour-over, where flow rate is the variable you are trying to control.
