Bean paste is is a kind of condiment, the main ingredients are broad beans, soybeans, etc., and the auxiliary ingredients are chili peppers, sesame oil, salt and so on. Bean paste belongs to fermented reddish-brown seasoning. According to the different habits of consumers, in the production of bean paste is formulated with sesame oil, soybean oil, monosodium glutamate, chili and other raw materials, while increasing the variety of bean paste, loved by the people.

The sauce was inadvertently created by Fan Li. Legend has it that Fan Li managed the kitchen in a wealthy owner's house when he was seventeen years old. Due to his inexperience, the food was often not cooked to his liking and there was a lot left over, which over time became rancid food. In order to prevent his master from discovering the food, Fan Li put it in the pantry. However, there is no impermeable wall, this matter was eventually discovered by the owner, who scolded him and limited him to ten days to turn the rancid food into something useful. The clever Fan Li first long green hairs white hairs of the food with things to deal with, and then dry and then fry with a pot to remove the odor to kill bacteria, add some warm water and stir into a paste to feed the pigs. The rich man was quite happy to see the pigs eating happily. Later, a small worker and Fan Li joked, the food in the noodles to Fan Li, did not expect, the noodles especially flavorful. At this time, the little worker only told the original story, and inspired by this, Fan Li used this rancid hairy food to create a delicious sauce.