Combine grapes, sugar and water and boil until the skins are soft and the grapes are squishy. Remove from heat and add cornstarch, butter and a dash of salt. Pour into the unbaked pie crust (using a top crust is optional) and bake at 375° for 40-50 minutes. When baking, you may need to cover the crust with foil for half the time to make sure it doesn’t burn.
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