Vigna subterranea (common names: bambara groundnut, bambara nut, bambara bean, congo goober, earth pea, ground-bean, or hog-peanut) is a member of the family fabaceae. the plant originated in west africa. vigna subterranea ripens its pods underground, much like the peanut (also called a groundnut). they can be eaten fresh or boiled after drying, and can be ground either fresh or dry to make puddings.

Source: Wikipedia