Yuzu is a frost-hardy citrus fruit relative native to China, Tibet from where it has been introduced to Korea and Japan. The yuzu's flavor is resembling grapefruit and Mandarin orange. Used in garnishing, the juice as a seasoning, it may be used to make marmalade or can be added to cakes. It is also used to make liquor and wine. In Japan bathing with yuzu on at the winter solstice is a popular custom; whole fruits are floated in the hot water of the bath, releasing the fragrant aroma from the skin of the fruit.