This Onion and Feta Cheese Tart is a savory and delicious dish that is perfect for any occasion. The tart is made with a flaky pastry crust and filled with caramelized onions and creamy feta cheese. The combination of the sweet onions and tangy feta creates a flavorful and satisfying tart. Serve it as an appetizer or as a main course with a side salad for a complete meal.