Peaberry is the special bean that is created when one of the beans in the cherry does not develop. It stops growing when it is just a tissue sliver, and the other bean is left to develop inside of the cherry. As a result, this particular bean that is left, takes on an egg-shape. Tasters and avid drinkers explain how the peaberry packs a more intense flavor. This coffee is the rarest coffee of all, with less than 4% of the crop yielding the high quality bean.