♦ Combine sugar, cornstarch and salt in a saucepan.
♦ Add water and 2 cups of blueberries.
♦ Cook over medium heat, stirring constantly, until mixture comes to a boil and is thickened. Mixture will be clear and very thick.
♦ Remove from heat and stir in butter and lemon juice.
♦ Gently, fold remaining 2 cups raw blueberries into cooled mixture and pour into pie shell.
♦ Serve with whipped cream.