2. Put the sliced apples into a large bowl. Mix the sugar, cinnamon, nutmeg, and 1 T of flour in another bowl, then sprinkle over the apples. Toss until the slices are coated, sprinkle with lemon juice, and toss again. Pour into the pie crust.
3. Blend the brown sugar, butter, and the other 2 T of flour with a fork. Sprinkle over the apples.
4. Bake for 10 minutes, lower heat to 350°, and bake another 45 minutes, until the crust is golden brown.