Brine Cocktail Onions are one of the condiments that provide delicious and useful taste to different foods. These little, brined onions are immersed in a solution of water, vinegar and spice which gives them crisp texture with delicious taste. The brine enhances the onion’s flavor with a tart and seasoned taste that goes well cocktails, platters as well as salads. These small onions can be added to appetizers and spice up sandwiches or burgers.