Step 1: Make the Pastry

1. 1. Rub the butter into the flour: In a large mixing bowl, add the flour and butter. Rub the butter into the flour using your fingertips until the mixture resembles fine breadcrumbs.

1. 1. Add sugar and egg yolk: Stir in the caster sugar. Then, add the egg yolk and 2-3 tablespoons of cold water, mixing until the dough comes together. If needed, add more water, but do not overwork the dough.

1. 1. Chill the dough: Shape the dough into a ball, wrap it in cling film, and refrigerate for at least 30 minutes.

Step 2: Prepare the Filling

1. 1. Peel and slice the apples: Peel, core, and slice the apples. Place them in a large bowl and toss with lemon juice to prevent browning.

1. 1. Add sugar and spices: Mix the sliced apples with the caster sugar and ground cinnamon. If the apples are juicy, sprinkle with 1 tablespoon of flour to help thicken the filling.

Step 3: Assemble the Pie

1. 1. Preheat the oven: Preheat your oven to 190°C (375°F).

1. 1. Roll out the pastry: Divide the chilled dough into two portions. Roll out one portion on a lightly floured surface to fit a 9-inch pie dish. Line the pie dish with the rolled pastry, pressing it into the corners.

1. 1. Add the apple filling: Spoon the apple mixture into the pie dish, spreading it evenly.

1. 1. Top with the second layer of pastry: Roll out the second portion of dough and place it over the apples. Trim the excess pastry, then crimp the edges to seal the pie. Cut a few small slits in the top to allow steam to escape.

1. 1. Egg wash and sugar: Brush the top of the pie with the beaten egg and sprinkle with granulated sugar.

Step 4: Bake the Pie

1. 1. Bake the pie: Place the pie in the preheated oven and bake for 45-50 minutes, or until the crust is golden brown and the filling is bubbling.

1. 1. Cool and serve: Allow the pie to cool slightly before serving. It’s best enjoyed warm with a scoop of vanilla ice cream or a dollop of whipped cream.