Blueberry Pie

1 baked pie shell
4 cups fresh blueberries
1 Tablespoon cornstarch
1/3 cup sugar
1/4 teaspoon lemon juice

Place 2 cups of berries in pie shell.  Blend cornstarch, sugar, lemon juice and remaining 2 cups berries.  Cook, stirring until thickened.  Pour over berries in pie shell.

Serve with ice cream or Cool Whip.