Blueberry Pie Filling
["1 qt. blueberries", "1 c. sugar", "3/4 c. cold water", "1 Tbsp. lemon juice", "3 Tbsp. cornstarch", "1/4 tsp. salt", "2 Tbsp. butter (optional)"]
["Put blueberries, sugar, 1/2 cup water, lemon juice and salt in saucepan.", "Bring to a boil.", "Add cornstarch that has been dissolved in 1/4 cup water.", "Cook until thick.", "Cool.", "Place in uncooked prepared pie crust."]
["blueberries", "sugar", "cold water", "lemon juice", "cornstarch", "salt", "butter"]