. First, we wash the peeled wheat grains and cook them. After cooking, we dry the wheat (there must be no water). Then crush the koji and mix in the wheat kernels. Finally, we put the wheat in a basin and cover it with a quilt. After two days, we can smell the quilt. If there is a smell of wine, we can take the quilt away, but pay attention to one thing: you must never open it for two days, you can only smell it!