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+ servings
a slice of caramelized red onion tart with honey being poured on top
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5 from 9 votes

Puff Pastry Caramelized Onion Tart

Imagine serving this amazingly colorful and gorgeous puff pastry caramelized onion tart up at your next dinner party. Not only is it striking in appearance, but it is also super easy to put together. Using frozen puff pastry makes it even easier, and is just perfect for hassle-free entertaining.
Prep Time10 mins
Cook Time20 mins
Total Time30 mins
Course: Appetizer
Cuisine: Anytime
Keyword: caramelized onion tart
Servings: 6 serves
Calories: 365kcal

Ingredients

Quick Caramelized onions (See Notes)

  • 2 tablespoons olive oil
  • 4 medium-sized red onions sliced thinly
  • 4 tablespoons coconut sugar
  • 2 teaspoons apple cider vinegar

Assembling The Tart

  • 1 puff pastry sheet thawed
  • 1 ½ tablespoons cold butter cubed
  • 4 tablespoons fig jam
  • 3-4 tablespoons feta crumbled
  • 1 egg whisked with 1 teaspoon of water

Instructions

  • Preheat oven to 400F (200C).
  • In a larger skillet heat the olive oil over medium heat. Once hot add the thinly sliced onion and stir to coat completely.
  • Cook the onion until completely softened, about 10 minutes, and then add in the coconut sugar and apple cider vinegar. Stir to combine and continue to cook until the sugar has melted and has become almost syrupy in consistency. Set aside to cool slightly.
  • Roll out the thawed puff pastry sheet and transfer it to a baking sheet lined with parchment paper. 
  • Score the pastry all around the edge with a fork and poke the inside of the pastry rectangle several times.
  • Spread 3 tablespoons of the fig jam across the inside of the puff pastry, avoiding the edges, and reserve the rest for later.
  • Arrange the cooked red onion across the pastry and then sprinkle on the feta cheese and cubed butter.
  • Fold in the edges to make a rim, and brush the edges with the egg and water mixture.
  • Bake in the preheated oven for 20-25 minutes until the edges of the pastry have become golden brown.
  • Remove from the oven and use a pastry brush to brush the remaining fig jam over the edges (for best results warm the jam in the microwave to give it a looser texture that makes brushing easier).
  • Allow to cool for a few minutes, slice, and serve.

Notes

Caramelized Onions:
The method used here is for quick caramelized onions. If you would prefer caramelized onions with a more intense flavor then follow the instructions in this recipe: Balsamic Caramelized Onions Plus Tips, Tricks, and Uses.
Puff  Pastry Tip:
The puff pastry will bake at its best when it is thawed but still cold.
Don’t leave it out to get too warm or it will become difficult to work with.

Nutrition

Calories: 365kcal | Carbohydrates: 39g | Protein: 6g | Fat: 21g | Saturated Fat: 7g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 10g | Trans Fat: 1g | Cholesterol: 48mg | Sodium: 245mg | Potassium: 150mg | Fiber: 2g | Sugar: 14g | Vitamin A: 168IU | Vitamin C: 6mg | Calcium: 70mg | Iron: 1mg