Soybean is the main raw material for making soy sauce. How is soybean made into soy sauce?

Soybean is the main raw material for making soy sauce. Let's learn how to make soy sauce from these soybeans.

First, the geographically mature soybeans are harvested with a harvester, and the harvested soybeans are transported to a soy sauce processing plant, where traditional soy sauce will be made in hundreds of wooden pots. The first step is to pour the soaked soybeans into this steamer for cooking for four hours, in order to soften the beans and make them easier for microorganisms to decompose. The taste of soy sauce depends on the protein content of soybean. Pour out the steamed soybeans and let them cool slowly. Then prepare an appropriate amount of wheat and corn, stir-fry them and grind them into fine particles, and mix them with cooked soybeans. They are stored in a big wooden jar three meters high, which is exactly the height of one floor.

Secondly, for the convenience of operation, workers pour these mixtures into wooden pots on the second floor, and then mix yeast with salt water and add them together. The workers kept stirring with bamboo poles to make the mixture completely and evenly mixed. Then stir regularly every week, so that the fermentation in the tank will be uniform. After six months, yeast and other microorganisms began to decompose soybeans, which led to discoloration of soybeans. 500 days later. The sauce has turned dark brown, so you can start the next step.

Third, spread the prepared filter cloth in the mold and spray the sauce from the nozzle. Workers spread the sauce evenly with wooden boards, then folded the filter cloth at the edge, put in the second filter cloth and continued to pour the sauce. Every time the sauce is poured, the same repeated operation will happen, and the sauce will overlap with the filter cloth layer by layer. Finally, the sauce will filter out from the filter cloth and flow into the vat below. Finally, these soy sauces are put into bottles and cartons, which can be transported to supermarkets for sale. At this point, the brewing process of soybean into soy sauce is all over.