Hoison sauce is available in a bottle or jar in the Asian foods aisle of most supermarkets, near the soy sauce. Also called Peking sauce, this thick, reddish-brown sauce is sweet and somewhat 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 hoisin sauce and it will keep indefinitely.