bean paste can be made from broad beans or soybeans. Using broad beans as raw materials, the production method is as follows: ① The characteristics of the finished product: dark brown sauce, rich aroma, fresh, salty and slightly sweet. (2) key points of production: boil broad beans in boiling water, peel them off, put them in a pot until they are crisp and rotten when pinched by hands, then pour them into a table, spread them flat, cover them with straw with a thickness of about 3 cm, put them in a place without sunlight and air circulation, stir them once every three days, and move them to a ventilated place after about a week. After yellow hairs (mold) grow on the watercress, put them in salt and put them into an altar, and then wash them and air them. Be careful not to touch water and oil to avoid insects or deterioration. Finally, seal it with yellow mud. After standing for about half a month, the sauce color turns black, smells fragrant, and tastes fresh, salty and sweet. The production method using soybean as raw material is as follows: ① The characteristics of the finished product: reddish sauce color, fragrant and sweet taste. ② Proportion of ingredients: 7 parts of soybean, 3 parts of flour, 1.7 parts of salt and 1 parts of water. (3) key points of production: remove impurities from soybeans, wash the dust with water, soak for 8-1 hours until the soybeans swell and are wrinkle-free, control off the water and put them in the pot, and cook until they are crushed with one pinch (usually cook for 2 hours, then stew for 6-8 hours), and they are mushy and yellowish brown. Then, the cooked beans are cooled, and when the temperature drops to about 37℃, they are mixed with flour, covered with clean cloth, and fermented at a slightly higher temperature. A layer of yellow-green hair can grow in about one week. At this time, it is smashed into small pieces, put into a jar, add salt and water, and stir well. Then put the sauce jar in a sunny and warm place. Beat steak in 1 days. When the sauce is reddish and fragrant, it can be eaten.