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Caramelized Onion & Blue Cheese Puff Pastry Tarts Recipe

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4.6 from 91 reviews

These Caramelized Onion & Blue Cheese Puff Pastry Tarts are elegant, savory bites perfect for entertaining or a sophisticated snack. Sweet caramelized onions pair beautifully with tangy blue cheese and a touch of fig jam on flaky puff pastry, finished with fresh thyme and a honey drizzle for a perfect balance of flavors.

Ingredients

Scale

Puff Pastry

  • 1 (17.3 oz.) package puff pastry, thawed in the fridge overnight

Caramelized Onions

  • 2.5 pounds white or yellow onions, halved, then sliced 1/8″ thick
  • 1 tablespoon butter
  • 1 tablespoon olive oil
  • 1 teaspoon granulated sugar
  • 1 tablespoon dry white wine
  • Kosher salt, to taste

Toppings & Finishes

  • 1 egg, beaten (for egg wash)
  • 9 oz. fig jam
  • 5 oz. crumbled blue cheese
  • 2 teaspoons fresh thyme leaves
  • Honey, for drizzling

Instructions

  1. Heat Butter and Oil: Heat the butter and olive oil in a large pot over medium heat, preparing the pan for caramelizing the onions.
  2. Add Onions and Salt: Stir the sliced onions in the pot to coat with oil and cook for 10 minutes. Then, add a pinch of kosher salt to aid in drawing out moisture.
  3. Continue Cooking Onions: Cook onions for a total of 60 minutes, stirring every 4-5 minutes. After 30 minutes, reduce heat to medium-low to help slowly caramelize.
  4. Add Sugar: At 40 minutes into cooking, add 1 teaspoon granulated sugar to enhance the caramelization and sweetness. Continue stirring frequently.
  5. Deglaze with Wine: When the onions reach a rich dark brown after 60 minutes, pour in 1 tablespoon white wine and deglaze the pan by scraping the browned bits off the bottom. Set aside.
  6. Preheat Oven: As the onions finish cooking, preheat the oven to 400°F (200°C) to prepare for baking the tarts.
  7. Prepare Puff Pastry: Unroll both sheets of thawed puff pastry and cut along the seams into 6 rectangles total, then cut each rectangle into 3 squares, making 18 squares overall.
  8. Score the Tart Crust: Use a knife to score a half-inch border around the edge of each puff pastry square to create a crust edge.
  9. Arrange on Baking Sheets: Transfer the squares about an inch apart onto two parchment paper-lined baking sheets.
  10. Apply Egg Wash: Brush the outer crust edges of each tart square with beaten egg to promote browning.
  11. Add Fig Jam: Spread about 1 teaspoon of fig jam in the center of each tart square.
  12. Top with Caramelized Onions: Add 1 teaspoon of caramelized onions on top of the fig jam.
  13. Add Blue Cheese: Sprinkle 1 teaspoon of crumbled blue cheese over the onions on each tart.
  14. Bake Tarts: Bake the assembled tarts in the preheated oven for 18-20 minutes, or until the puff pastry is dark golden brown and fully puffed.
  15. Finish and Serve: Remove from oven, sprinkle fresh thyme leaves over each tart and drizzle with honey. Serve warm or at room temperature.

Notes

  • You can substitute yellow onions with sweet onions for a milder flavor.
  • Be patient with the caramelization process; stirring regularly prevents burning and ensures even cooking.
  • Use cold puff pastry and handle it as little as possible to maintain flakiness.
  • Store leftovers in an airtight container and reheat in the oven to retain crispness.
  • This recipe can be doubled or halved easily depending on the number of servings needed.

Keywords: caramelized onion tarts, blue cheese tarts, puff pastry appetizers, savory tarts, fig jam tarts

Find it online: https://tastybynova.com/caramelized-onion-and-blue-cheese-puff-pastry-tarts-recipe/