Pie crust

1. In your food processor (or a large bowl), combine the flour, sugar and salt. Using a box grater, grate the frozen butter atop the flour mixture. Pulse the mixture for a second or two, just until the butter is evenly mixed with the flour and the mixture resembles crumbs. (If doing this by hand, quickly crumble the two together with your hands.)
2. Add 4 tablespoons of water and mix it in. This will lightly moisten the mixture. Keep adding it tablespoon by tablespoon, quickly pulsing or mixing between each addition, just until the dough comes together (when you can pinch it and it holds together).
3. Flour your counter and transfer the dough onto it. Bring it together with your hands, knead just until it forms a shape, form it into a disk and wrap in plastic wrap. Transfer it to the fridge and chill for at least an hour, ideally overnight.
4. BAKE:
   Preheat oven to 204°C (400°F) and lightly butter a 9-inch pie dish. Set aside. Remove the dough from the fridge and leave it on the counter for 10 minutes (can be less if your kitchen is very hot), so it comes to room temperature. Generously flour your work surface and rolling pin. Roll the dough from the middle outwards in all directions, forming a large 13-inch (33-cm) circle. Keep rotating the dough as you roll it, so it doesn’t stick to your work surface. Wrap the dough around your rolling pin and transfer it to the prepared baking dish. Gently fit it into the bottom and up the sides of your pie dish. Trim the dough around the dish, leaving about a 1.5 inch (almost 4 cm) overhang.
5. Tuck the overhand under itself all around, then decoratively make indentations in it with a fork. Brush the edge with egg wash. Lightly brush a piece of parchment paper with oil and nestle it into the pie crust. Pour over dried (or baking) beans or pie weights.
6. Transfer to the oven, bake for 20 minutes, until the edges are slightly golden brown. Remove from oven, lower the temperature to 150°C (300°F), carefully remove the parchment and beans from the pie.
7. Bake for another 20 minutes, until the shell is golden brown. Set aside to cool completely.

Vanilla pudding

1. In a medium heatproof bowl, mix the egg yolks with sugar. In another bowl, combine the flour and cornstarch then add to the egg mixture. Mix until you get a smooth paste, set aside.
2. In a saucepan bring milk just to boiling (right when milk begins to foam up). Remove from heat and slowly add to the egg mixture, whisking constantly to prevent curdling.
3. Pour this mixture into a clean medium saucepan and cook over medium heat until boiling, whisking constantly. When it begins to boil, whisk for another 30-60 seconds just until it becomes thick. Remove form heat and whisk in the vanilla paste and rum (if using).
4. Pour into a clean glass bowl and cover the surface with plastic wrap (put it directly on the pudding, to prevent a crust from forming). Cool to room temperature before using (or store in the fridge overnight).

Applesauce filling

1. In a medium saucepan combine the chopped apples with 1/2 of the water (120ml or 1/2 cup). Sprinkle with 2 tablespoons of sugar and cover the pot with lid. Cook on medium-high heat and bring to a boil. Add cinnamon and keep cooking (stirring occasionally) for about 15 minutes, until the apples are very soft. – When the water has evaporated add the other half you saved. You only want enough water so the apples don’t stick to the pan.
2. Transfer cooked apples to a food processor (without any remaining liquid). Blend until apples are completely pureed (however the applesauce will still look grainy).
3. Transfer the applesauce back to the pot, taste to see if you want more sugar or cinnamon.
4. In a small bowl, combine the cream and cornstarch. Add to the applesauce and cook over medium-high heat just until it it begins to bubble up. Cook for another 30 seconds, transfer to a bowl and cool to room temperature.

Assembly (When all three – the pie crust, vanilla pudding and applesauce have cooled, you can put the pie together.)

1. If you’ve been chilling it for a long time, mix the vanilla pudding with a spatula first, to make it easily spreadable, then spread it all over the bottom of the pie crust. Top with the applesauce, as evenly as possible. Cover the pie with plastic wrap and place it in the fridge.
2. Make whipped cream:
   In your stand mixer, combine the cream and sugar. Whisk on medium speed until stiff peeks form.
3. Take the pie out of the refrigerator and spread whipped cream all over.
4. Sprinkle with cinnamon, then chill until serving time.