Prepare AA Cake Mix as directed on package with 3/4 cup melted butter and water; set aside. Pour remaining 3 tablespoons melted butter in bottom of round baking pan. Sprinkle sugar over top of butter; spread blueberries over top of sugar. Squeeze lemon over top of sugar and blueberries. Spread cake batter over top. Bake at 325° for 45 minutes. Makes about 10 servings.