This sticky onion tart is a savory and indulgent dish that is perfect for any occasion. The tart features a buttery and flaky crust filled with caramelized onions and a rich and creamy filling. The onions are cooked until they are soft and sweet, creating a deliciously sticky texture. The tart is then baked until golden and bubbly, creating a mouthwatering aroma. Serve this tart as an appetizer or as a main course with a side salad for a satisfying meal.