Red Onion and Blue Cheese Tart

Name: Red Onion and Blue Cheese Tart
Prep time: 20 min
Cook time: 47 min
Total time: 1 h 7 min
Cuisine: France
Ingredients: 1 roll of puff pastry; 3 red onion (medium); 2 tbsp of olive oil; 1 tbsp of turbinado sugar; 1 tbsp of balsamic vinegar; 100 g of blue cheese (crumbled); 1 pinch of salt; 1 pinch of pepper

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An elegant, flavorful savory tart combining the sweetness of caramelized red onions with the bold character of blue cheese, all on a crisp puff pastry. Ideal as an appetizer or a light dish.

Total time: 1 h 07
Prep: 20 min
Cook: 47 min
Difficulty: Easy
Per person: €1.25

By the CookinBreak team

Ingredients 8

servings

Estimated cost €5.00

Equipment

Skillet
Parchment paper
Baking sheet
Oven
Cutting board
Knife

Instructions

Tap a number to check off the step, and a time to start a timer.

Preheat the oven to 350 °F. Unroll the puff pastry onto a baking sheet lined with parchment paper. Prick the base with a fork.

Peel and thinly slice the red onions. In a pan, heat the olive oil over medium heat.
Add the sliced red onions and sauté for about until tender. Add the brown sugar and balsamic vinegar. Let caramelize gently for , stirring regularly.
Season the caramelized onions with salt and pepper.
Spread the red onion mixture over the puff pastry, leaving a border of a few centimeters free. Sprinkle the crumbled blue cheese over the onions.
Bake for , or until the pastry is golden and crisp and the cheese is melted and lightly browned.
Once the tart is baked, take it out of the oven. Sprinkle with fresh or dried oregano before serving warm.

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Goes well with

🎅 Christmas: all recipes

As a starter

Baked Camembert with Honey and Walnuts

20 minEasy

For dessert

Chocolate Truffles

15 minEasy

To drink

Cranberry Orange Cocktail

10 minEasy

Nutrition facts

per serving · estimate

420kcal

Protein12 g11%
Carbs28 g26%
Fat30 g63%
Fiber2 g

Share of each nutrient in the calories of one serving.

Good to know

Chef's tip

For an even more intense flavor, let the red onions slowly confit over very low heat for longer. You can replace the blue cheese with goat cheese or feta for a different version. Serve this tart warm with a green salad for a balanced meal.

Freezing : Can you freeze this recipe?

Yes

Works very well, up to 2 months after baking in airtight packaging or plastic wrap.

Storage : How long does it keep?

Keeps 2 to 3 days max in an airtight container in the fridge. The pastry may soften.

Making ahead : Can you make it the day before?

Yes

The onions can be confited ahead of time. The tart can be assembled and baked the day before, then reheated.

Reheating : How do you reheat it?

Oven: 15-20 min at 160°C to bring back the crispness. Air fryer: 5-8 min at 160°C. Microwave: not recommended (softens the pastry).

Variations

Sprinkle with fresh or dried oregano before serving warm.
Leave a border of a few centimeters free on the pastry.
Serve as an appetizer or a light dish.

Mistakes to avoid

Forgetting to prick the pastry base.
Piling the onions all the way to the edge: leave a border free.
Burning the onions: caramelize them gently.

Frequently asked questions

How do you caramelize red onions?

Slice the onions thinly, sauté them for about 10 minutes in olive oil over medium heat until tender, then add the brown sugar and balsamic vinegar and let them caramelize gently.

How do you assemble the tart?

Unroll the puff pastry onto a baking sheet lined with parchment paper, prick the base, spread the caramelized onions leaving a border free, then sprinkle with the crumbled blue cheese.

How long do you bake the tart?

Bake for 25 to 30 minutes at 180 °C, until the pastry is golden and crisp and the cheese is melted and lightly browned, then serve warm.

What do you serve this tart with?

Sprinkled with oregano, it is served warm as an appetizer or a light dish with a green salad. Its balance between the sweetness of the onions and the character of the blue cheese is a hit at a festive aperitif.