Caramelized Onion and Cheese Tart

Short Description

This Caramelized Onion and Cheese Tart is a savory, elegant dish featuring sweet, slow-cooked onions and rich, melted cheese nestled in a buttery, golden pastry. It’s a perfect option for brunch, lunch, or a sophisticated appetizer.

Why You’ll Love This Recipe

• Deep, rich flavor from slow-cooked caramelized onions

• Creamy, melted cheese for a satisfying savory bite

• Flaky, buttery crust that’s easy to work with

• Great for entertaining or everyday meals

• Can be made ahead for convenience

• Customizable with different cheeses and toppings

• Pairs well with salads, soups, and wines

• Impressive presentation with minimal effort

• Suitable for vegetarians

• Delicious hot, warm, or at room temperature

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

• Olive oil

• Unsalted butter

• Yellow or sweet onions, thinly sliced

• Salt

• Black pepper

• Balsamic vinegar

• Puff pastry sheet, thawed

• Gruyère cheese, shredded

• Fresh thyme leaves

• Egg (for egg wash)

Directions

1. Caramelize the Onions: Heat olive oil and butter in a skillet over medium-low heat. Add sliced onions, a pinch of salt, and pepper. Cook slowly, stirring often, for 40–45 minutes until deeply golden and soft. Stir in balsamic vinegar during the last 5 minutes. Let cool.

2. Prepare Pastry: Preheat oven to 375°F (190°C). Roll out the puff pastry slightly on a floured surface. Transfer to a parchment-lined baking sheet or tart pan.

3. Assemble the Tart: Spread the caramelized onions evenly over the pastry, leaving a border. Sprinkle shredded Gruyère over the onions. Add fresh thyme leaves.

4. Egg Wash and Bake: Brush the exposed pastry edges with beaten egg. Bake for 20–25 minutes, or until the pastry is puffed and golden, and cheese is melted.

5. Cool and Serve: Let rest for a few minutes before slicing. Serve warm or at room temperature.

Servings and Timing

• Servings: 6–8 slices

• Prep Time: 15 minutes

• Cook Time: 1 hour

• Total Time: 1 hour 15 minutes

Variations

• Cheese Options: Try goat cheese, feta, cheddar, or mozzarella.

• Add Meat: Add crispy bacon, pancetta, or ham for extra depth.

• Add Vegetables: Include roasted red peppers, mushrooms, or cherry tomatoes.

• Herb Infusion: Use rosemary, basil, or oregano instead of thyme.

• Mini Tarts: Use a muffin tin or cut puff pastry into small squares for bite-sized versions.

Storage/Reheating

• Storage: Keep leftovers in an airtight container in the refrigerator for up to 3 days.

• Reheating: Reheat in a 350°F (175°C) oven for 10–15 minutes. Avoid microwaving to maintain crispness.

• Freezing: You can freeze the unbaked tart. Assemble, freeze on a tray, then wrap and store. Bake from frozen, adding 5–10 minutes to cooking time.

FAQs

Can I make the onions ahead of time?

Yes, caramelized onions can be made up to 3 days in advance and stored in the refrigerator.

Do I need to blind bake the pastry?

No, the tart bakes fully with the filling added directly on the uncooked puff pastry.

What other cheeses can I use?

You can substitute Gruyère with cheddar, goat cheese, fontina, or blue cheese.

Can I make this tart without eggs?

Yes, the egg is only used for brushing the crust. It can be omitted if needed.

Is puff pastry the only option?

You can also use shortcrust or phyllo dough, though baking times may vary.

How do I keep the crust from getting soggy?

Ensure the onions are fully cooked and not watery. Baking on a preheated tray also helps crisp the bottom.

Can I serve this tart cold?

Yes, it’s delicious cold or at room temperature and works well for picnics or lunchboxes.

Is this recipe vegetarian?

Yes, if you use vegetarian-friendly cheese, it is suitable for vegetarians.

Can I make individual tarts?

Yes, cut the pastry into smaller portions and reduce the baking time slightly.

How do I know when it’s done?

The tart is ready when the pastry is golden brown and the cheese is fully melted and bubbling.

Conclusion

This Caramelized Onion and Cheese Tart offers a perfect balance of sweet and savory flavors in a beautiful, flaky crust. It’s easy to make, yet sophisticated enough for special occasions. Whether served as a main or side dish, it’s sure to impress with every bite.