First, we need to clean this mung bean. After all, there is some dust on the surface of this mung bean, so after we clean this mung bean, we need to put it in a basin and then add some water. Don't use too much water, just a little, and then we need to freeze this mung bean in the freezer of the refrigerator. Then when you freeze it, you will find that this mung bean is particularly hard. At this time, you can actually start making this mung bean soup. We are going to take this mung bean out and put it directly in the pot, add some water, boil it on high fire, then turn to medium fire and add some water. Repeat this for 2~3 times, and you will find that the mung bean will boil and bloom soon.