Cashew Nut grows as a single, hard growth beneath a fleshy apple-like fruit. While both the soft covering and the kernel are edible, there is a toxic oil in the cashew nut's shell which needs to be removed before eating. Kajú is a drink made from the fruit. Cashew nuts are eaten as a snack raw or roasted and salted, or used in baking, or made into cashew nut butter.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.