Tarte Tatin

Peel the apple.
Slice each apple in two.
Place the apple slices into a bowl full of water mix with lemon juice.

Preheat the oven to 180. and put the pie tray empty in it. 
Cut the butter into cubes.

Prepare the caramel by eating up half of the sugar in a pan. Move it around a bit so that all the surface of the pan is covered and leave it there.
Once it starts to caramelize, pour the rest of the sugar.
When it start to properly melt mix it to make sure all the sugar disolves itself.
Then add the cubes of butter and wait for the caramel to form, mixing continuously. Take of the fire and add a bit of lemon juice.

Pour the caramel into the pie tray.  
Tighlty place the apples vertically in the tray, making sure they can't move around. They will loosen up while cooking.
Sprinkle some salt on top.
Cook for 40 minutes.

Take it out of the oven. 
Place the dough on top and make a small hole in the middle.
Cook for another 15 to 20 minutes in the oven at 180.