Grape Jam
1.
Prepare the ingredients, peel and remove the seeds of the cleaned grapes. Place the grape skins and pulps in a bowl for later use. At the same time, squeeze the lemon out of the juice for later use. Put the grape skins into an acid-resistant pot (enameled ones are good) and add water to fire. Bring to a boil, then reduce the heat and cook until the juice is purple-red
2.
Remove the grape skins, pour the grape pulp and lemon juice into the pot and boil over medium heat. Turn to low heat and add the maltose to continue cooking. When cooking, stir with a wooden ladle continuously. When the maltose is completely melted, add the fine sugar
3.
Continue to cook until the sauce is thick