Preheat oven to 450 degrees. Sort, rinse and halve berries. Place berries in pastry shell. Sift flour, sugar and salt together in a med. size bowl. Add sour cream and stir well. Pour mixture over berries and spread evenly. Sprinkle reserved sugar over the top. Bake for 10 min. Reduce heat to 350 and bake additional 30 min. or until crust is a gentle golden brown.