Hoisin sauce is a thick, dark sauce commonly used in Chinese cuisine. It is made from fermented soybeans, sugar, vinegar, and various spices, giving it a sweet and savory flavor. Often used as a dipping sauce or marinade, it enhances dishes like Peking duck and stir-fries. This versatile sauce can also be found in other Asian cuisines, such as Vietnamese and Thai dishes. It is popular for adding depth to recipes and can be used in dressings or as a glaze for meats and vegetables. Hoisin sauce is a staple in many kitchens for its rich taste and adaptability.