Snow White Cocktail Onions (8oz). Small-sized, snow-white onions in vinegar. Signature garnish of the Gibson, Bloody Marys or any other classic cocktail that call for an onion. A signature garnish of the Gibson, Bloody Marys, or any other classic cocktail that calls for an onion, these pickled white onions are silvery white in color and mildly sweet in taste. They are also one of the best garnishes for classic cocktails, like the Gibson. Pickled in vinegar, Collins Snow White Onions are the perfect finishing touch to cocktails and other drinks.