Yuzu is the combination of a little mandarin orange and a lemon-like citrus fruit. It turns green to orange-yellow as it ripens, and its skin is loose and slightly wrinkled. The juice and zest of yuzu are used to flavor alcohol, add flavour to cream for desserts, and make marmalade or jam. Most of the time, this low-acid citrus is used in Japanese food, but it is also popular in Korea and China. Over the years, yuzu has become a popular ingredient in American cocktails. Its tart juice and robust, pleasant floral smell make it a favourite.