An easy grape juice recipe involves mashing of the fruit and cooking it in water for a few minutes. Sugar is added, if desired, and the cooked mixture is strained through a cheesecloth. The juice is served chilled. Alternatively, it is canned or stored in a freezer.
To make the grape juice, de-stem the fruit and clean under cool water. Using a potato masher, mash the grapes in a bowl to extract the maximum juice.
Place the mashed grapes in a large pot, and add an adequate quantity of water so that it covers the fruit. Cook the grapes over medium to high heat. When the mixture boils, lower the heat, and allow it to simmer for approximately 10 minutes. Stir constantly to prevent the grapes from adhering to the bottom of the pot.
As the grapes cook, stir in 1 tablespoon of sugar. Taste the mixture for sweetness, and add more sugar, if desired. Finally, strain the cooked mixture into a pitcher, and chill the juice in the refrigerator. Consume the grape juice within a day.
To store the juice, pour it in a jar with a tight lid, and keep it in the refrigerator for five to seven days. To store the juice for longer periods, pour it into freezer bags, and place in the freezer. Alternatively, fill the juice in a glass jar, leaving 1/4 inch of headspace, and expose the jar to boiling water for about 10 minutes. Store in a cool place.