The story says that Tatin sisters invented this tart baked upside-down. In effect, the apples are cooked underneath the crust. Leave it to cool in a cold place.
Tart preparation Take the pastry out of the refrigerator.
Put the sponge cake tin or pie plate on low heat. Add the 150 gr of butter cut into small pieces. All the sugar must melt into the butter, if not add some butter. Wait for a few minutes until it browns. You may stir gently to blend the caramel.