Capers are the unopened flower buds of a straggling spiny shrub, Capparis spinosa, in the family Capparaceae. It has been known for millenia and is cultivated in the Mediterranean region. This species grows wild in the Mediterranean region as well as in North Africa and from Turkey west to the Gobi Desert. The buds are pickled in vinegar and used as a condiment; they are also often included in sauces (e.g., tartar sauce) and with raw meat (e.g., steak tartare). The plant has thick leaves, each with a pair of spines at its base. The white or pinkish flowers ar 4 to 6 cm across. (Vaughan and Geissler 1997)
- Vaughan, J.G. and C.A. Geissler. 1997. The New Oxford Book of Food Plants (revised and updated edition). Oxford University Press, New York.