A speciality coffee flavour note across London.
Key lime in the cup presents as a bright, sharp citrus acidity with a thin-skinned, almost pithy quality that distinguishes it from the rounder sweetness of orange or the clean tartness of lemon. The note carries a faintly floral, slightly herbal edge alongside its sourness, and can leave a crisp, zingy finish. It typically arises from high levels of malic and citric acids in the green bean, and is most commonly preserved by light roasting that allows the bean's native chemistry to remain intact.
This note is often associated with coffees from East African origins, particularly Ethiopia and Kenya, where the combination of high altitude, heirloom varieties, and fertile soils tends to produce pronounced citrus-forward acidity. Washed processing typically highlights key lime characteristics most clearly, as the removal of fruit pulp before drying allows the bean's intrinsic brightness to come through without added fermented sweetness. Certain Central American origins, such as those from high-altitude Guatemalan or Costa Rican growing regions, can also produce this quality, particularly in naturally acidic cultivars processed with care.
On a bag or cafe menu, look for tasting notes that reference citrus acidity, lime zest, or descriptors such as "sharp", "bright", or "clean finish", which suggest the kind of acid structure that carries key lime character. Filter brew methods such as pour-over or Chemex tend to allow this delicate acidity to express itself most clearly, as they produce a clean, unobstructed cup. Espresso preparation is less likely to foreground this note, though it may appear as a bright top note in a lighter roast pulled at a relatively short extraction.
Take our 60-second flavour quiz and discover roasts across London that are aligned with your palate — including ones carrying key lime notes.