The caper berry is the flower bud of Capparis Spinosa, a Mediterranean shrub, cultivated for its buds. The caper berry resembles a large grape with white stripes, or actually more like a teeny tiny watermelon. It has a much less intense flavor than a caper. They are preserved in water, vinegar, and salt. The caperberry can be eaten like an olive. The Caper Berries have become a very popular garnish for the Martini.