2. Wash the red beans first, soak them in clear water and put them in the refrigerator for one night, which will help the red beans to sand more easily when they are cooked.
3. After soaking the dried tangerine peel, scrape off the white clothes with an iron spoon.
4. Put the red beans and old water into clear water and simmer for one hour. During this period, press the red beans with a spoon and simmer for half an hour. Remember to adjust the fire throat according to the condition of the soup, and the time should be increased or decreased according to actual needs.
5. At last, add rock sugar until it melts, then turn off the fire, put it in the refrigerator and eat it at any time.