This ultimate fall and winter tart showcases the best fruits of the season: pears, apples and cranberries. Unlike other tarts, the tarte tatin is made upside down in a skillet. You start by cooking the fruit, then top it with the dough, carefully tuck in the edges and let it cook. When it's ready you invert the whole tart onto a plate. It comes out looking beautiful and is actually much easier than you might imagine.