An estimated 1.75 million liters of commercial balsamic vinegar and 1,760 liters of traditional balsamic vinegar are sold annually. Noted for its rich color, intense fruity aroma and exquisite sweet-and-sour flavor, it has become America's most coveted condiment. It is now served in the trendiest restaurants and is frequently featured in gourmet food magazines. For gourmets who want to learn more about this uncommon elixir and use it to add a touch...