Other forms: yuzus
A yuzu is a sour fruit that's related to lemons and oranges. A ripe yuzu is the size of a clementine and has a bumpy peel that's bright yellow.
The fragrant East Asian yuzu is a hybrid fruit, a cross between a sour mandarin orange and an Ichang papeda. It was originally grown in China, though it's most often found in Japanese and Korean cuisine, from soups and sauces to desserts. Yuzu isn't just sour — its flavor is complex, often described as a combination of citrus fruits with floral undertones. Yuzu is Japanese, and in Korean it's called yuja.