The method of soaking black beans in mature vinegar: First, prepare a proper amount of black beans, mature vinegar and a glass container with a lid. Step 2: Wash the black beans with clear water and put them on a plate to dry. Step 3: Put the black beans in a wok, stir-fry for about 5 minutes, and let them cool. Step 4: put the black beans into a glass container, not full, almost half. Step 5: Pour in the aged vinegar, and the amount of aged vinegar should not exceed that of black beans. Step 6: Cover and marinate in a cool and dark place for 1 month, and you can eat it. Delicious and delicious, it is everyone's favorite food.