Carob is sometimes used as a substitute for chocolate. The carob tree, Ceratonia siliqua, is a species of flowering evergreen shrub or tree in the pea family, Fabaceae, that is native to the Mediterranean region. It is cultivated for its edible seed pods. Carobs are also known as St. John’s bread because, according to tradition of some Christians, St. John the Baptist subsisted on them in the wilderness. A similar legend exists of Rabbi Shimon bar Yochai and his son.