(courtesy of the Epicurious dictionary).
A sour Japanese citrus fruit, which is used almost exclusively for its aromatic rind. The rind of the yuzu (which is about the size of a tangerine) has an aroma that's distinct from lemons and limes or any other Western citrus fruit. Yuzu rind is used as a garnish or small slivers are added to various dishes to enhance their flavor. It can be found in some Japanese markets.
© Copyright Barron's Educational Services, Inc. 1995 based on THE FOOD LOVER'S COMPANION, 2nd edition, by Sharon Tyler Herbst.
My addendum? "Also apparently every cheftestant's fave ingredient. So, so trendy."