Ingredients:

4 cups blueberries
1 cup sugar
3 tbsp. cornstarch
1/4 tsp. salt
1/4 cup water
1 tbsp. lemon juice
1 tbsp butter
 1 9" baked & cooled pie shell

Procedure:

Place 2 cups fresh blueberries into baked & cooled pie shell.
Cook 2 cups berries, sugar, cornstarch, salt, water, and lemon juice until thick.
Stir in butter.
Pour over berries in pie shell.
Chill.