Tarte Tatin is probably the most famous upside-down pie. It is very simple and incredibly tasty. Delicate crumbly dough, a layer of juicy apples, soaked in golden caramel and delicious flavor. This pie is usually served warm with a scoop of vanilla ice cream, but it is also very good when cold. It is said that this dessert was invented by accident in the hotel belonging to Tatin sisters in the late 19th century. One of the sisters forgot to put the dough for the pie in the form before putting the filling, and to fix this unfortunate mistake, she decided to cover the apples with the dough on the top.