1. Select black beans with green flesh, remove impurities and wash them. Description: Black beans have green meat, yellow skin, and green skin is the best. ...

2. Soak the washed black beans in clear water for one night. In the process of soaking, black and green will gradually become fatter and bigger.

3. The black beans were soaked the next morning, and the black beans became bigger.

4. Soak the beans in the casserole or iron pot in black bean water, and start to cook with high fire until cooked.

5. Prepare some mature vinegar, pour it into black beans and cook a little for black beans to absorb. Note: Vinegar should be brewed naturally.