Preheat oven to 375 degrees F (190 degrees C).
Place sliced apples in a large bowl. Sprinkle with lemon juice if
desired. In a small bowl, mix together white sugar, 2 tablespoons
flour, cinnamon, and nutmeg. Sprinkle mixture over apples. Toss until
apples are evenly coated. Stir in raisins and walnuts if desired.
Spoon mixture into pastry shell.
In a small bowl mix together 1/2 cup flour and brown sugar. Cut in
butter or margarine until mixture is crumbly. Sprinkle mixture over
apple filling. Cover top loosely with aluminum foil.
Bake in preheated oven for 25 minutes. Remove foil and bake an additional
25 to 30 minutes, until top is golden brown. Cool on a wire rack.
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