It is a crystalline block made from the mineral ferrous sulfate ore hydrochlorite

The brine ingredients of stinky tofu are tempeh, soda ash, alum, shiitake mushrooms, winter bamboo shoots, salt, and Maotai liquor Made by cooking the same ingredients.

Boil black soybeans, cool, add mushrooms, winter bamboo shoots, white wine and other condiments, and soak for about 15 days.