Instructions
Step 1: Prepare the Onions
- In a large skillet, heat the olive oil (or butter) over medium heat. Add the sliced onions and a pinch of salt.
- Cook, stirring occasionally, until the onions are soft and begin to brown (about 20–25 minutes). If you like, sprinkle in the sugar halfway through to help the caramelization process.
- Once caramelized, remove from heat and let them cool slightly.
Step 2: Prepare the Pastry Base
- Preheat your oven to 400°F (200°C). Roll out the puff pastry sheet on a lightly floured surface to smooth any creases.
- Transfer the pastry to a baking sheet lined with parchment paper. Score a border about an inch from the edges, being careful not to cut all the way through. This will create a nice crust edge for the tart.
- Brush the edges with the beaten egg to give it a golden finish.
Step 3: Assemble the Tart
- Spread the ricotta cheese evenly over the center of the pastry, staying within the scored lines.
- Distribute the caramelized onions over the cheese layer, spreading them evenly.
- Sprinkle with fresh thyme leaves and a light layer of grated Parmesan or Gruyère if desired.
Step 4: Bake
- Bake the tart in the preheated oven for 20–25 minutes, or until the pastry is golden and the edges are puffed. The cheese will be slightly melted, and the onions should have a slightly crispy, golden appearance.
Step 5: Serve
- Remove from the oven and let it cool for a few minutes. Slice into squares or wedges and serve warm or at room temperature. This tart is delicious on its own or paired with a crisp green salad.
Tips for the Best Caramelized Onion Tart
- Go Slow with the Onions: Patience is key for the perfect caramelization. Keep the heat at medium or medium-low, so the onions become soft and brown without burning.
- Herb Options: Fresh thyme or rosemary pairs beautifully, but you could also use chives, sage, or even basil for a twist.
- Cheese Alternatives: For more flavor, try using goat cheese, Gruyère, or even a little blue cheese. These cheeses complement the sweet, rich onions wonderfully.
Variations to Try
- Bacon & Onion Tart: Add a few slices of cooked, crumbled bacon for a smoky flavor.
- Mushroom & Onion Tart: Sauté sliced mushrooms with the onions to add an earthy richness.
- Tomato & Onion Tart: For a summery twist, add sliced tomatoes on top of the onions before baking.
Final Thoughts
A caramelized onion tart is a simple, satisfying way to enjoy rich flavors without heavy preparation. Its combination of creamy cheese, sweet onions, and crisp pastry is sure to be a hit whenever you serve it. Enjoy this tart as a starter, a light meal, or even a midday snack – it’s a classic that’s versatile enough for any occasion!
