Summer Berry Pie
["1 1/2 c. raspberries", "1 1/2 c. strawberries, sliced", "1 c. blueberries", "1 (9-inch) baked pastry shell, cooled", "3/4 c. sugar", "3 Tbsp. cornstarch", "1 1/2 c. water", "1 pkg. (4 serving size) strawberry Jell-O", "1 (8 oz.) tub Cool Whip"]
["Mix berries in a large bowl.", "Pour into pastry shell."]
["raspberries", "strawberries", "blueberries", "pastry shell", "sugar", "cornstarch", "water", "strawberry"]