Caramelized Onion Tart with Bubbly Gruyere and Flaky Crust

Caramelized Onion Tart: Imagine biting into shatteringly crisp puff pastry topped with slow-cooked mahogany onions and melted, bubbly Gruyere. This bistro-style tart is the savory masterpiece your brunch table is missing—click to master the art of the perfect onion jam!