Grape Pie
["4 c. Concord grapes, stemmed", "1 1/3 c. sugar", "4 Tbsp. cornstarch", "2/3 c. water", "1/4 tsp. salt", "1/8 tsp. cinnamon", "1 Tbsp. butter"]
["Wash and drain grapes.", "Remove skins, but do not discard. Place grape pulp in a saucepan; bring slowly to a boil.", "Boil for 5 minutes and force through a sieve to remove seeds.", "Combine sieved pulp and skins.", "Combine sugar, cornstarch, water and salt; add to pulp.", "Cook over low heat until thickened, stirring constantly.", "Add cinnamon and butter; cool.", "Turn into baked shell."]
["Concord grapes", "sugar", "cornstarch", "water", "salt", "cinnamon", "butter"]