Creating Apple Hand Pies is simple if you follow these steps:

1. Make the Dough: In a large mixing bowl, combine the flour, salt, and sugar. Add diced butter and mix until the mixture resembles coarse crumbs. Gradually add cold water, mixing until the dough comes together. Form the dough into a ball, wrap in plastic, and refrigerate for at least 30 minutes.

2. Prepare the Filling: In another bowl, toss the chopped apples with brown sugar, cinnamon, nutmeg (if using), and lemon juice until well coated. Set aside for the flavors to meld.

3. Roll Out the Dough: Once chilled, roll out the dough on a lightly floured surface to about 1/8-inch thickness. Cut out circles using a cookie cutter or round bowl (about 4-5 inches in diameter).

4. Fill the Pastry: Place about 2 tablespoons of the apple filling on one half of each dough circle, making sure to leave a margin around the edge.

5. Seal the Pies: Fold the other half of the dough over the filling to create a pocket. Press down the edges to seal, and use a fork to crimp the edges for added security.

6. Prepare for Baking: Preheat your oven to 375°F (190°C). Arrange the sealed hand pies on a baking sheet lined with parchment paper.

7. Egg Wash: Beat the egg in a small bowl and brush it over the tops of the hand pies for a golden finish. Sprinkle some extra granulated sugar on top for added sweetness.

8. Bake: Place the baking sheet in the preheated oven and bake for 30-35 minutes or until the pies are golden brown.

9. Cool: Once baked, remove the Apple Hand Pies from the oven and let them cool on a wire rack for about 10-15 minutes.

10. Serve and Enjoy: These hand pies are best enjoyed warm but can also be stored at room temperature.