Peel and finely dice the Green Apple (3).
Sprinkle the apples with Corn Starch (1 tablespoon) and toss until cornstarch is gone.
In a large skillet over medium heat, melt the Butter (1/4 cup). Add the apples, Granulated Sugar (1/3 cup), Brown Sugar (1/3 cup), Lemon Juice (1 tablespoon), Ground Cinnamon (1 teaspoon), and Salt (1/4 teaspoon). Stir to combine.
Add a couple of pinches of Ground Nutmeg (2 pinch). Stir to combine.
Cook down, stirring, until apples are soft and the filling is thickened, around 10 minutes. Remove from heat and let it cool completely.
Preheat the oven to 375 degrees F (190 degrees C).
Make cinnamon sugar sprinkle by combining Granulated Sugar (1 tablespoon), Ground Cinnamon (1 tablespoon), and Salt (1 pinch) in another small bowl.
Lay the Pastry Dough (2 sheet) out on a piece of parchment paper and cut into 6 even pieces. Cut diagonal slits into half the pieces - these are the tops.
Brush the edges of the bottom pieces with Egg (1) and add 2-3 Tbsp of cooled apple filling to each.
Add the top piece and press along the sides with a fork to seal, then place your pies in the fridge for 10-15 minutes. This will help the pies to keep their nice, rounded shape.
Sprinkle with the cinnamon sugar. Bake for 20-25 minutes, until the tops are golden brown.
Let cool and serve.