1. Select out the impurities, such as bad ones.

2. Selected soybeans with a small fire gently fry a little, you can put some Chenpi, camphor leaves and so on, will be fragrant fried.

3. Fried beans with water and wash clean and with a leaky tool to filter out the water.

4. Amoy good beans with water to cook, the water should be just over as well, you can cook while adding water, depending on the number of beans, time to cook to the hand pinch beans, beans can be easily crushed into a state of mud, experienced based on the color can be identified.

5. Cooked beans leak water.

6. Fermentation: Put the black bean grass on the bottom of the pot (the pot will also work), then spread the cooked beans on top of the black bean grass while it's still hot, and then put the black bean grass on top of the pot and put a lid on it and wait for it to ferment. About three or four days, not too long, long time will be sour. Fermented beans cover is hot, beans on top of a white layer, turn with chopsticks, you will find like lotus root like tugging like.

7. Take out the fermented beans, put in the appropriate salt, chili powder, ginger, garlic, pepper powder and so on and mix well to dry can be.

8. Enjoy the sun for a few days, after drying the beans are black, one grain at a time.