This Goat Cheese and Red Onion Tarte Tatin is a savory twist on the classic French dessert. Caramelized red onions are layered with tangy goat cheese and baked in a buttery puff pastry crust. The result is a rich and flavorful tart with a perfect balance of sweet and savory. Serve it as an appetizer or a main course with a side salad for a delicious and impressive meal.