Black Bean Sauce is an essential condiment for anyone who loves making authentic Chinese food at home. This black bean sauce recipe is made from a combination of broth, black beans, rice wine, and green onions. The black bean mixture is combined with garlic and ginger that has been sauteed in oil. Cornstarch helps to thicken the sauce. This homemade black bean sauce can be stored in the refrigerator for up to a week. It can be used in stir-fries or tossed with noodles for a simple but flavorful mean.