Put the sliced apples in a big microwave-safe bowl, and stir in the brown sugar,cinnamon, salt, nutmeg, lemon juice, and boiled cider.
Microwave the filling, uncovered, for 5 minutes. This softens the apples just a bit, and gets their juices flowing. Skip this step if you like; it's not critical,though we think it helps.
Stir in the flour or Pie Filling Enhancer.
Preheat the oven to 425°F.
Remove the crust from the refrigerator. If it's been chilling longer than 30 minutes,give it 10 minutes or so to warm up a bit. Roll it into a 12 1/2" to 13" circle.
Lightly grease a 9" pie pan, preferably one that's at least 1 1/2" deep, and lay the crust in the pan, settling it into place gently. Don't tug at it or stretch it; this could cause it to shrink as it bakes.
Spoon the filling into the crust.