1. Soybeans should be used, and there are no side effects. 3. You can use aged vinegar. 5. Eat as a snack. 2. Dry fry the beans in a pot, then cool them in vinegar and put them in the refrigerator. You can eat it in a moment. 4. Watch the beans absorb water. I read it from a book in the library. I tasted it during the holiday. It was not cold in vinegar and turned sour. . . I can't eat it. . . You should pay attention. .