Balsamico is the must of white Trebbiano grapes that are cooked down and concentrated over time. The process of making balsamic vinegar was developed and perfected in Modena, home to the Giusti family, who have been making balsamic vinegar in their attic there since 1605. Today, this family-run business uses 300-year-old barrels and 20- to 25-year-old blending vinegars to produce outstanding 3-, 6-, 8-, and 10-year old balsamics, as well as top-of-the-line traditional balsamics. Italian food and wine guru Burton Anderson believes Giusti vinegars to be the finest on the market.