Onion Preserve Onions are a unique, delicious an edible bulbs with a pungent taste and smell, composed of several concentric layers. So to create something really different, we combined onions, sugar ad red wine vinegar vinegar for a wonderfully full-flavored jam that you're sure to love. Impress your guests by pairing it with smooth, strong brie and red wine vinegar. Our products are not your average products found in grocery stores. Ours are what the people of Tuscany, and other regions of Italy eat or make at home. Guaranteed the finest quality at reasonable prices