• The fruit of a tree, Citrus grandis, which looks like a large pale green grapefruit and has a firm sharp-tasting white or pink flesh and a very thick skin. It probably originated in southern China but is now grown throughout Southeast Asia. There are 3 main groups: the Thai which is relatively small and of high quality, the Chinese which is medium-sized with a coarse juicy flesh and the Indonesian which is the largest and is perfectly spherical. They are usually eaten by removing a segment and peeling away the walls on two sides.