Caramelized Onion, Apple & Cheddar Tart

Caramelized Onion, Apple & Cheddar Tart is a savory-sweet dish that combines the deep richness of slow-cooked onions, the crisp freshness of apples, and the sharp bite of cheddar cheese—all layered on a golden puff pastry crust. This rustic tart is the perfect blend of comfort and elegance, ideal for brunch, a light lunch, or an appetizer that will impress.

Why You’ll Love This Recipe

This tart brings together an irresistible mix of flavors and textures: sweet onions, tart apples, and sharp cheddar nestled in buttery, flaky pastry. It’s simple to make yet feels gourmet and is versatile enough to serve warm, room temperature, or even cold. Whether you’re feeding a crowd or just treating yourself, this tart is the kind of recipe that feels special without the stress.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• Puff pastry sheet, thawed
• Yellow onions, thinly sliced
• Olive oil or butter
• Fresh thyme (optional)
• Salt
• Black pepper
• Apple (firm variety like Honeycrisp or Granny Smith), thinly sliced
• Sharp white cheddar cheese, shredded
• Egg, beaten (for egg wash)

directions

1. Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. In a skillet, heat olive oil or butter over medium heat. Add sliced onions and a pinch of salt. Cook slowly for 20–25 minutes, stirring occasionally, until golden and caramelized. Add thyme if using.
3. Roll out the puff pastry slightly and place it on the prepared baking sheet. Score a 1-inch border around the edges and prick the center with a fork.
4. Spread the caramelized onions over the center of the pastry, avoiding the border.
5. Layer thin apple slices over the onions, then top with shredded cheddar.
6. Fold in the pastry edges slightly to form a border and brush with beaten egg.
7. Bake for 20–25 minutes, or until the crust is golden and the cheese is melted and bubbling.
8. Let cool slightly before slicing and serving.

Servings and timing

This recipe serves 6.
Prep Time: 15 minutes
Cook Time: 25 minutes (plus 20 minutes to caramelize onions)
Total Time: 60 minutes

Variations

• Add bacon: Crumbled cooked bacon adds a smoky, savory touch.
• Swap cheeses: Try Gruyère, brie, or blue cheese for a different flavor profile.
• Add mustard: Brush a little Dijon mustard on the pastry base before adding toppings.
• Fresh herbs: Sprinkle chopped rosemary or sage on top before baking.
• Mini tarts: Cut the pastry into smaller squares for individual servings.

storage/reheating

Store leftover tart slices in an airtight container in the refrigerator for up to 3 days.

To reheat, place in a 350°F (175°C) oven for 8–10 minutes until warmed through and crisp. Avoid microwaving, which softens the pastry. This tart can also be served at room temperature.

FAQs

What type of apples work best for this tart?

Use firm, tart apples like Granny Smith or Honeycrisp—they hold their shape and balance the sweetness of the onions.

Do I have to caramelize the onions?

Yes, caramelizing adds depth and sweetness. It’s worth the time for the best flavor.

Can I make it ahead of time?

Yes, you can prep and bake the tart a few hours in advance. Reheat in the oven before serving.

Can I freeze the tart?

You can freeze it after baking and cooling completely. Reheat in the oven straight from frozen.

What other cheeses can I use?

Try Gruyère, aged white cheddar, fontina, or even goat cheese.

Can I use store-bought puff pastry?

Yes, store-bought puff pastry works perfectly for this recipe and saves time.

Do I need to peel the apples?

Peeling is optional. Leaving the peel on adds color and texture.

Can I make this vegetarian?

It is vegetarian as written. Just ensure your cheese and pastry are suitable if following a strict diet.

What should I serve with it?

A simple green salad or a bowl of soup pairs perfectly with this tart.

Can I serve it cold?

Yes, this tart is also delicious at room temperature or cold, making it great for picnics or leftovers.

Conclusion

Caramelized Onion, Apple & Cheddar Tart is a flavorful, elegant dish that’s easy to make and hard to forget. With its combination of savory, sweet, and tangy elements layered on flaky pastry, it’s the kind of recipe that feels gourmet but requires no fuss. Serve it as a light meal, a starter, or part of a brunch spread, and enjoy the perfect harmony of comfort and class.

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