Can't. Persimmon cakes in the middle of the black part of the persimmon is the persimmon pectin in the air-drying process of condensation formation, and because the pectin contains toxic substances, such as tannins and phytochemicals and other such substances in the pectin drying process will be gathered together to form lumps, resulting in persimmon cakes in the middle of the black part of the inedible.