Easy Canned Grape Juice - cooking recipe

Ingredients

Concord grapes
sugar

Preparation

Wash Concord grapes; pick from stems.
Into a clean quart jar, put 1 to 2 cups grapes.
(I usually use 1 1/2 cups grapes.)
Do not skin or seed.
Add 3/4 to 1 cup sugar.
Fill jar to overflowing with boiling hot water; partially seal.
Process in 275\u00b0 oven for 30 minutes; complete the seal.
The juice is ready to drink after 6 weeks standing.
Strain the grapes from the liquid.
You can eat the grapes or make a pie out of them.
The juice has a particularly fresh sparkling flavor.
(This is a 50's recipe from high school economics book.)