Banana tarte tartin was something extra Chef Micheal made. Looks great and taste better than the apple tarte tartin. Ofcourse, the more ripe the bananas, the sweeter the tarte, hence better tasting. We've only got half green bananas. --_--
You bake the apples on a bed of sugar and butter, then you bake your puff pastry base. Put them together, you get tarte tartin!