Easy Canned Grape Juice
["Concord grapes", "sugar"]
["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.)"]
["grapes", "sugar"]