Concord Grape Pie
["4 c. Concord grapes", "3/4 c. sugar", "3 Tbsp. quick cooking tapioca", "1 Tbsp. lemon juice", "pastry for one 2-crust, 9-inch pie", "2 Tbsp. butter or margarine"]
["Slip skins from grapes; reserve skins.", "In medium saucepan over high heat, heat grape pulp to boiling, stirring occasionally; reduce heat to low and simmer 5 minutes, stirring.", "Press pulp through sieve into medium bowl to remove seeds.", "Add grape skins, sugar, tapioca and lemon juice; mix well.", "Let stand while preparing pastry."]
["Concord grapes", "sugar", "tapioca", "lemon juice", "pastry", "butter"]