Hoisin sauce is a thick Chinese condiment with a sweet and spicy flavor. It is typically red in color and used in a variety of dishes, including as a dipping sauce for duck, as a condiment for chicken and shrimp, and as a base for barbecue sauce. Hoisin sauce is made with ingredients such as soybeans, sugar, vinegar, and various spices, and is available in cans or jars. Once opened, it should be kept refrigerated in a tightly sealed container.