Hoisin sauce is a thick, pungent sauce commonly used in Chinese cuisine as a glaze for meat, an addition to stir fries, or as dipping sauce. It is darkly colored in appearance and sweet and salty in taste. Although regional variants exist, hoisin sauce usually includes soy beans, red chillies and garlic. Vinegar, Chinese five spice and sugar are also commonly added. The word hoisin is from the Chinese word for seafood, but the sauce does not contain any seafood ingredients.
—Hoisin sauce from Wikipedia, the free encyclopedia