Hoisin sauce 海鲜酱 (hǎi xiān jiàng)

A Chinese condiment similar to barbeque sauce, it has a sweet, tangy, mildly fruity flavor and is made with fermented soybeans, garlic, vinegar, and sugar. While it is often thought to be the sauce eaten with Peking duck, Beijingers actually eat that dish with sweet noodle sauce. Hoisin sauce is readily available in the Asian food aisle of the supermarket.