1. Soak in water. After mung beans are soaked in water, immature male beans float on the water.
2. Screening, selecting male beans by screening. After soaking mung beans in water for 4 hours, use a sieve to remove the water, leaving the female beans on the sieve and the male beans on the ground.
3. Watch the plumpness of mung beans, and observe their plumpness when selecting mung beans. The fat one is a female bean and the flat one is a male bean.
4. Remove the oily beans and throw away the pulp. If watercress is blue, it is beans.
The above methods are for your reference. For more information, it is recommended to consult a senior chef.