Caper, is a pickled flower bud used as a seasoning in salads and in sauces, including tartar sauce. The buds come from a low, trailing shrub called the caper bush that grows primarily in the Mediterranean countries. The caper bush blooms early in summer and has pinkish-white flowers with four petals. The unopened buds are pickled in salt and vinegar to make the seasoning.
Scientific classification: The caper bush belongs to the caper family, Capparidaceae. Its scientific name is Capparis spinosa.