The first thing is to choose beans. There should be no signs of decay on the surface of beans. It is necessary to ensure the freshness of beans, otherwise the germination rate of beans will be particularly affected. Find a container, fill it with water, pour the beans in, let the water fully submerge the beans, and soak for about five hours. After five hours of soaking, some rotten beans that have not been found at first will surface at this time, and they will be picked out and dropped.
Prepare a large plastic bottle, that is, the rest of the beverage bottle that we usually drink. Cut the bottle open with scissors. The place where the scissors cut is one-third from the mouth of the bottle, that is, subtract the relatively narrow part of the bottle. Then, at the bottom of the beverage bottle, many small holes are densely tied with needles to play the role of drainage. After the bottle is processed, pour the soaked beans into the beverage bottle, water them thoroughly, and then cover the beans with a thick gauze. The purpose of this gauze is to keep the water in the bottle from evaporating too much and keep the beans moist. Then wrap a layer of black plastic film around the bottle to avoid light. Water it three times a day until it is thoroughly watered. About a day later, the beans began to sprout, and two days later they could grow to an edible length. Bean sprouts don't need to be sprouted for too long, because after a long time, they may become bitter and affect the taste.