Wash the grapes with some flour, and put them together in a juicer to break them_
Put the squeezed grape juice into the flat stainless steel pot together with the broken flesh and add the appropriate amount of white sugar. If the juice is relatively small, add some water and boil it on high heat.
After boiling, add a proper amount of maltose to a small fire and slowly knead it. Mix it in the middle to avoid the bottom_
When the juice is thick, turn off the heat, cool it and put it into a sealed bottle. After cooling, put it in the refrigerator and refrigerate.