Preheat oven to 375 degrees.
In a large bowl, toss apples in lemon juice. In a separate bowl, mix 3 T flour, white sugar, cinnamon and nutmeg until well combined. Toss apples with flour mixture. Dump apples into prepared pie shell.
In a small bowl, mix together brown sugar wi2th 1 cup flour. Cut in butter until mixture forms small crumbles. Sprinkle mixture over apple filling.
Cover top of pie very loosely with aluminum foil.
Bake in preheated oven for 25 minutes. Remove the foil and bake an additional 25 to 30 minutes or until filling is nice and bubbly, apples are tender, and the top is golden brown.