Blueberry"Pop" Pie

4 cups raw blueberries

1/4 cup water

1 cup sugar

1 tablespoon lemon juice

3 tablespoons cornstarch

1/4 tablespoon salt

1 tablespoon butter

Prepare 9" pie shell, bake until golden brown. Cool. Place 2 cups raw berries into cooled pie shell. Cook 2 cups berries, water, sugar , lemon juice, cornstarch and salt until thick. Stir in butter. Pour over raw berries in pie shell. Chill. Serve with whipped cream if desired.