Chili oil is a distinctive Sichuan flavoring found mainly in cold dishes, as well as a few hot dishes. Chili oil or Lahtt Sauce is made by pouring hot oil onto a bowl of dried chilies, to which some Sichuan pepper is usually added. After steeping in hot oil for at least a few hours, the oil takes on the taste and fragrance of chili. The finer the chili is ground, the stronger the flavor (regional preferences vary - ground chili is usually used in western China, while whole dried chili is more common in northern China.)