3/4 c. sugar
4 tbsp. cornstarch
1 c. water
3 1/2 tbsp. blackberry flavored jello
3 to 4 c. fresh blackberries
1 baked 9-inch pastry shell
whipped topping

Combine sugar, cornstarch and water in saucepan. Cook over medium heat, stirring constantly, until thickened. Remove from heat; add jello, stirring until dissolved. Gently stir in berries. Pour into pastry shell and chill. Serve with whipped topping.