Yuzu

A yuzu (Citrus aurantium, formerly C. junos; Japanese ユズ, 柚, 柚子) is a citrus fruit that grows in Japan. It looks a bit like a small grapefruit, and can be either yellow or green. Its flavor closely resembles that of the grapefruit, with overtones of Mandarin orange.

Bathing with yuzu is said to be good for the skin.