1. Pick out the broken soybeans and wash them with clean water;

2. Soak in cold water until the grains are full, and soak overnight;

3. Cook the beans (it is best to steam them if possible). They should be cooked thoroughly, and they will be broken with a gentle pinch, but the beans are intact;

4. drain the water. (Don't use water for boiling beans), drain it dry. When it's dry, grab a handful of water and I'll blow it dry with a fan.

5. Sprinkle flour and stir, so that each bean is evenly covered with flour, and it is ok, not much;

6. Spread evenly in a dustpan (a basket for washing vegetables without dustpan is also acceptable) with a thickness of 3-5cm;

7. Wrap the beans up and down with cotton cloth. Don't expose the beans, clamp them with a clip, and put them in a dark and damp place with the bottom overhead.

8. The next step is to wait for mildew, which will take about 5 days. During this period, the surface of the cloth will be heated by hand, indicating that it is fermenting. Don't open it, the beans will catch cold when exposed to the outside, and bad black fungus will grow when exposed to the outside air.

9. It's good to feel cool. It takes about 3-5 days in summer, depending on the season. On the third day, you can open a corner and have a sneak look. Yellow mold is the best, followed by white mold, so you can't have it. I opened it halfway this time and it turns out to be black. Fortunately, most of it is yellow, so I can use it after removing it.

1. bask in the sun and break the lumps;

11. Put it into a container without oil and raw water, and add cold salted boiled water. The amount of salt is more than that of stir-fried ones (it's too light and easy to break. If it's not salty enough, you can add it later when stirring). Pay attention to the sun-dried bean koji and salted boiled water before operation, otherwise it will sour;

12. Expose yourself to the sun, and stir it every day when it cools down. Hot stirring will turn sour. Sun for at least half a month, and the cloudy state will be sun-cured. After drying, pour sesame oil on the surface, seal the refrigerator and take it out when eating. Stir-frying can replace soy sauce, which is very fresh.