Make the pie crust according to recipe instructions.
Place sugar in a saucepan and set over medium heat.
Once the sugar starts to melt, stir carefully with a spatula until all of the sugar has melted and is amber in color.
Add the butter and stir in. With the additions of butter and cream, the caramel will bubble up aggressively and that is completely normal but take care not to burn.
Once the butter is incorporated, pour in the cream. Stir until smooth then simmer for 5 minutes, add the salt and remove from the heat.
Peel and slice the apples and place in a large bowl. Add the flour, sugar and cinnamon and stir to combine.
Roll two sheets of pastry out on a floured surface. Press one pastry disc into a pie plate (I used a 20cm/9 inch pie plate).
The remaining pastry can be sliced into long strips to form the lattice pie crust. Alternatively, it can just be laid over the pie as is.
Add the apples to the pie plate then drizzle over half a cup of salted caramel.
Place the remaining pie crust over the filling then crimp the edges. Brush with beaten egg and place on a sheet pan.
Place in the oven and bake for 30-45 minutes or until the pie is golden brown on top and bubbling. If the top crust darkens too quickly, cover loosely with foil and continue baking.
Remove the pie from the oven and allow to cool for at least 30 minutes (but up to 24 hours in the fridge) before slicing and serving.