In a large mixing bowl, toss peeled and sliced apples with vanilla and lemon juice. Add in the brown sugar, cinnamon, nutmeg, salt, and cornstarch. Toss to coat the apples.
6-7 tart apples, 3/4 cup brown sugar, 1 teaspoon vanilla, 2 teaspoons lemon juice, 1 teaspoon ground cinnamon, 1/2 teaspoon ground nutmeg, 1/2 teaspoon salt, 3 tablespoons cornstarch
Spread the apples evenly into a well seasoned 10 inch cast iron skillet. Dot the top of the apples with small pieces of the butter.
2 tablespoons cold butter
Slice the puff pastry sheet into 1 x 1 1/2 inch rectangle pieces with a sharp knife or pizza cutter. Layer the pieces over the top of the apples in the cast iron pan, starting with the outside edge of the pan moving towards the center, barely overlapping the pastry pieces.
1 puff pastry sheet
Whisk together the egg and water to make an egg wash and brush over the top of the puff pastry. Sprinkle with additional sugar or Turbinado sugar.
1 egg, 1 teaspoon water
Bake the apple pie for 25-30 minutes. If the top is becoming too brown while baking, place a piece of foil over the top of the pie for the remaining baking time, until the apples are soft and the liquid is hot and bubbly.
1 tablespoon turbinado sugar
Allow to cool 30 minutes to 1 hour before serving.
Notes
Nutrition facts are just an estimate of the ingredients listed in the recipe.
Make and serve this pie on the same day for best results.