What is balsamic vinegar made from?

Authentic balsamic vinegar -- including Kosterina's -- is made exclusively from grape must: whole crushed grapes (skins, seeds, and juice) cooked down and aged in wooden barrels. Kosterina uses Trebbiano (white) and Lambrusco (red) grapes from Modena, Italy. No wine vinegar, no caramel, no added sugar -- just pure aged grape must.

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