Alessi 20-Year Balsamic Vinegar The art of producing balsamic vinegar has remained unchanged for hundreds of years, such is the case with our 20 Year Old Alessi Balsamic Vinegar. The boiled down musts of grapes are aged in barrels of varying woods and sizes until a perfect concentration is acheived. Aging balsamic vinegar maginfies the smoothness and complexity of the product. If you have ever sampled a high quality balsamic vinegar, you know of it's complex, sweet yet tangy flavor and intriguing aroma.