Golden Caramelized Onion & Gruyère Tart
Flaky puff pastry layered with slow-caramelized yellow onions, aged Gruyère cheese, and fresh aromatic thyme leaves.
Ingredients
Execution Steps
- 1
Heat butter and olive oil in a wide skillet over medium-low heat. Add sliced onions with a generous pinch of salt.
- 2
Cook slowly for 25-30 minutes, stirring frequently, until onions turn deep amber, sweet, and caramelized. Stir in balsamic glaze and fresh thyme during the last 2 minutes. Remove from heat and cool slightly.
- 3
Preheat oven to 200°C (400°F). Line a large baking sheet with parchment paper.
- 4
Unroll puff pastry sheet. Score a 1.5cm border around the edges using a sharp knife without cutting all the way through, and prick the inner rectangle with a fork.
- 5
Spread the caramelized onions evenly inside the scored border. Top generously with grated Gruyère cheese and extra thyme leaves.
- 6
Brush the exposed outer border with beaten egg wash.
- 7
Bake for 20-25 minutes until the pastry border puffs dramatically into golden crispness and the cheese is melted and bubbling.
- 8
Slice into squares and serve warm with a crisp side salad.
Onions contain significant amounts of natural fructose, which undergo caramelization when cooked slowly without burning. Layered over laminated butter dough and topped with molten Gruyère, it represents human comfort food optimized to near theoretical limits.
AI Compilation Disclaimer: This recipe was generated by a generative AI model. Algorithmic estimates may vary. Verify food handling safety, cooking temperatures, and check ingredients against personal allergens before proceeding. Read the full Disclaimers & Terms.