The authentic old Beijing bean juice to buy back is raw, need to buy back after their own home simmering, because the raw bean juice is inedible, and need to be with the water together with the simmering, generally need to be simmered for about 20 minutes, you can add an appropriate amount of sugar, in the simmering after the flavor of the bean juice will be better.

Beijing bean juice is Beijing's unique local food is water milled mung beans made of powdered dough, and then take the starch out of the green after the rest of the green-colored broth, made after boiling.