Black bean is a good slimming food, which is rich in nutrition, so that you can keep your skin moist while losing weight, and it is delicious with food. The method is as follows: 1. Wash a proper amount of black beans and soak them in cold water for about 3 hours? 2. Add a proper amount of rock sugar to the soaked black beans and boil. After boiling, simmer for 30 minutes and turn off the heat (note: only use the water soaked in black beans, don't pour it out)? 3. Black beans and bean sweat are raised separately? 4. When eating, black beans can be paired with cooked sweet potatoes (mashed together), rice (mixed together) and vegetable salad.