A quarter of a century of traditional aging gives this ultra-versatile condiment an intense, complex flavor. Balsamic vinegars like this one are among the most prized of Italian elixirs, crafted from the pure wine must (unfermented grape juice) of white Trebbiano grapes, which is aged in wooden barrels according to time-honored techniques. From Modena, Italy, ours is made by slowly simmering the grapes in copper cauldrons, then combining the reduction with older balsamic vinegar to help speed acidification. The blend is transferred to oak barrels, which imbue the aged vinegar with rich aroma, flavor and color. 15.5 oz. Made in Italy. A Williams Sonoma exclusive.