Oyster Sauce (Grade AA,A,B,C)

Oyster sauce describes a number of sauces made by cooking oysters. The most common in modern use is a viscous dark brown condiment made from sugar, salt and water thickened with cornstarch, flavoured with oyster essence or extract. Some versions may be darkened with natural colour, though high quality oyster sauce is naturally dark. It is commonly used in eastern cuisines.