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Caramelized Onion and Gruyère Tart Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.1 from 36 reviews
  • Author: Kimberly
  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Total Time: 45 minutes
  • Yield: 6 servings
  • Category: Tart
  • Method: Baking
  • Cuisine: French

Description

This Caramelized Onion and Gruyère Tart is a savory pastry delight featuring sweet, golden-brown caramelized onions layered over a flaky puff pastry crust and topped with melted Gruyère cheese. Infused with fresh thyme and baked to perfection, it offers a rich, comforting flavor ideal for brunch, lunch, or a stylish appetizer.

Ingredients

Pastry

  • 1 sheet puff pastry (thawed)

Filling

  • 2 large onions, thinly sliced
  • 2 tablespoons olive oil
  • 1 tablespoon butter
  • 1 cup Gruyère cheese, grated
  • 1 tablespoon fresh thyme leaves
  • Salt and pepper to taste

Finishing

  • 1 egg (beaten, for egg wash)

Instructions

  1. Preheat the Oven: Preheat your oven to 400°F (200°C) to prepare for baking the tart.
  2. Caramelize the Onions: In a skillet, heat the olive oil and butter over medium heat. Add the thinly sliced onions and cook for 20-25 minutes, stirring occasionally, until they are caramelized and golden brown. Season with salt, pepper, and sprinkle in the fresh thyme leaves for added flavor.
  3. Prepare the Puff Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the pastry to the pan and prick the bottom with a fork to prevent excessive puffing during baking.
  4. Assemble the Tart: Evenly spread the caramelized onions over the pastry base. Then, sprinkle the grated Gruyère cheese generously on top to create a rich, cheesy layer.
  5. Apply Egg Wash: Brush the edges of the puff pastry with the beaten egg. This step will give the crust a beautiful golden-brown finish when baked.
  6. Bake the Tart: Place the assembled tart in the preheated oven and bake for 25-30 minutes until the pastry is golden and the cheese is bubbling and slightly browned.
  7. Cool and Serve: Remove the tart from the oven and allow it to cool slightly before slicing. Serve warm to enjoy the full depth of flavors and the crisp texture of the pastry.

Notes

  • Ensure the onions are cooked low and slow to develop the best caramelization and natural sweetness.
  • You can substitute Gruyère with Emmental or Fontina cheese if desired.
  • For a crisper crust, chill the assembled tart in the fridge for 10 minutes before baking.
  • Serve with a simple green salad for a complete meal.

Find it online: https://slsrecipes.com/caramelized-onion-and-gruyere-tart-recipe/