Fresh Blueberry Pie Filling
["1/2 c. flour", "3/4 c. sugar", "1 Tbsp. vinegar", "1 qt. fresh blueberries", "1 (9-inch) pie crust"]
["Stir flour, sugar, vinegar and blueberries and place in pie crust.", "Bake at 350\u00b0 for about 50 minutes."]
["flour", "sugar", "vinegar", "fresh blueberries", "crust"]