Hoison sauce is available in a can or jar in the Asian aisle of most supermarkets, close to the soy sauce. Also called Peking sauce, this thick, reddish-brown sauce is sweet and spicy, and widely used in Chinese cooking. It's a mixture of soybeans, garlic, chili peppers and various spices. Hoisin sauce is mainly used as a table condiment and as a flavoring agent for many meat, poultry and shellfish dishes. Once opened, refrigerate bottled hoisin and it will keep indefinitely.