Peaberry, known in Spanish as caracolillo, is a type of coffee bean. Normally the fruit ("cherry") of the coffee plant contains two seeds ("beans") that develop with flattened facing sides, but sometimes only one of the two seeds is fertilized, and the single seed develops with nothing to flatten it. This oval (or pea-shaped) bean is known as peaberry. Typically around 5% of all coffee beans harvested have experienced this peculiarity. Normal coffee beans are less commonly called by contrast flat berry. Peaberry coffees are particularly associated with Tanzanian Coffee, although the peaberry variety of Kona Coffee has also become quite prominent.
Occasionally, growers will hand-select the tiny mutants for special sale, sometimes at a premium—not only because of their taste, but also because of the amount of labor involved, as well as their relative rarity.