Preheat the oven at 170° C.
Peel the apples and cut them into slices.
Use a tarte tin. Put the butter and sugar in the tin on the stove. Heat until melted.
Add the apples and cook until they soften.
Arrange them in the tin a little bit to be levelled.
Put the pastry on top. Make a few holes using a fork.
Bake in the oven for 20 min. Let it rest for 15 min then flip it over on a large plate.
