Sugar Free Apple Pie

I came up with this recipe for making an
apple pie without using any sugar at all.

Ingredients:
6 oz (1 cn) frozen apple juice (unsweetened concentrate)
2 tb Rounded all purpose flour
1 ts Cinnamon
1/4 ts Salt
5 To 7 apples
1 tb Butter or margarine
Nutmeg (optional)
1 9" double-crust pie shell (unbaked)

Directions:
In a small saucepan, combine the frozen apple juice,
flour, cinnamon and salt.
Stir constantly over medium heat until the
mixture is thick and bubbly, 3 to 5 minutes.
Peel and slice the apples and stir them into the apple juice mixture.
Pour the mixture into the unbaked pie shell and dot with butter.
Position the top crust over the filling,
cutting slits for the steam to escape.
Trim and seal the edges. Brush the top very lightly
with water and sprinkle with nutmeg if desired.
Bake at 450 degrees F. for 15 minutes.
Reduce heat to 350 degrees F. and bake for 30 minutes more.