Hoi Sin Sauce or Hoisin Sauce is a Chinese Gril Sauce. They're available in bottles, small jars or cans. Hoi Sin Sauce is made from fermented soy bean paste, dried chillies, sesame paste, sesame oil, soy sauce, salted plum puree, fermented red tofu, garlic and other spices. The sauce looks reddish brown and has a thick consistency. Hoi Sin Sauce tastes slightly sweet and hot.