Soak in cold water or boiling water for about 3 hours one night in advance. Mung bean is rich in nutritional value, containing carotene, vitamin B 1, vitamin B2, vitamin E, nicotinic acid and various mineral elements. Protein in mung beans, phosphatidylcholine, phosphatidylethanolamine and phosphatidylinositol in phospholipids are essential nutrients for many organs of human body, all of which have the functions of exciting nerves and stimulating appetite.