Caramelized Onion Tart with Gorgonzola and Brie

Crispy savory tart made with puff pastry, caramelized onions, and gorgonzola and brie cheeses.

Caramelized Onion Tart
Elise Bauer

A little while ago, on a visit to Annisquam, Massachusetts, my friends Ann and Nick hosted an "Impress the Food Blogger" dinner at their home.

Guests were encouraged to bring a favorite dish, and we all got to vote on what we thought would be a hit on the site.

The evening was a blast, the votes were tallied, and the winning dish? This caramelized onion tart! Or pizza as it was called, brought by Ann's friends Jeff and Marilyn.

Caramelized Onion Tart

I've made this tart several times since I first had it, and it's one of those dishes you want to limit to special occasions, because it's really hard to stop eating, it's that good.

Crispy, pillowy puff pastry, with balsamic caramelized onions, topped with sprinklings of gorgonzola, brie, and tarragon.

Caramelized Onion Tart
Elise Bauer

The original caramelized onion pizza recipe is from Marilyn and Jeff's friend Bonnie Stern, Canadian author of several cookbooks.

I played a bit with the recipe, rolling the dough out more thinly, reducing the amount of onions and cheese, so the serving pieces would be easier to hold and work better as appetizers.

Perfect for New Year's crowd. Enjoy and Happy New Year!

Caramelized Onion Tart with Gorgonzola and Brie

Prep Time 10 mins
Cook Time 50 mins
Total Time 60 mins
Servings 9 to 12 pieces

Tarragon is a summer herb, if you can't find any, you may crush a few fennel seeds (maybe half a teaspoon) and sprinkle over the tart. Or top with fresh chopped fennel fronds, after the tart has been taken out of the oven.


  • 2 tablespoons extra virgin olive oil

  • 4 cups sliced onions, sliced root-to-top into 1/4-inch thick slices (about 2 to 3 medium onions)

  • 1 tablespoon brown sugar

  • 2 tablespoons balsamic vinegar

  • 1/2 teaspoon salt

  • 1/2 teaspoon pepper

  • 8 ounces (1 sheet) frozen puff pastry, defrosted a couple hours in the fridge

  • 2 ounces chilled brie cheese, rind removed and diced

  • 2 ounces Gorgonzola or other blue cheese, diced

  • 2 tablespoons chopped fresh tarragon


  1. Caramelize the onions:

    Heat oil in a large deep pan on medium-high heat. Add onions and cook for about 10 minutes or until wilted and starting to brown. Add sugar, vinegar, salt and pepper.

    Elise Bauer
    Elise Bauer

    Reduce heat and cook gently, uncovered for 20-25 minutes or until richly caramelized. Add a little water if the onions look like they are starting to dry out. Cool.

  2. Roll pastry into a 10-to-14-inch rectangle:

    (or whatever shape you want). Place pastry on a baking sheet lined with parchment paper. Prick with a fork at a couple inch increments to prevent the pastry from forming big bubbles while baking.

    Elise Bauer
  3. Spread onions over pastry, all the way to the edges of the pastry. Dot with cheese. Sprinkle with tarragon:

    Refrigerate if not baking immediately.

    Elise Bauer
    Elise Bauer
  4. Bake in a preheated oven at 400°F:

    for 18-20 minutes or until cheese has melted and pastry is crispy. Cool for 5 minutes. Cut into wedges or squares and enjoy!


How to Slice an Onion

Caramelized Onion Tart
Elise Bauer
Nutrition Facts (per serving)
175 Calories
12g Fat
13g Carbs
4g Protein
Show Full Nutrition Label Hide Full Nutrition Label
Nutrition Facts
Servings: 9 to 12
Amount per serving
Calories 175
% Daily Value*
Total Fat 12g 16%
Saturated Fat 3g 15%
Cholesterol 8mg 3%
Sodium 221mg 10%
Total Carbohydrate 13g 5%
Dietary Fiber 1g 2%
Total Sugars 3g
Protein 4g
Vitamin C 2mg 9%
Calcium 44mg 3%
Iron 1mg 4%
Potassium 78mg 2%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
Nutrition information is calculated using an ingredient database and should be considered an estimate. In cases where multiple ingredient alternatives are given, the first listed is calculated for nutrition. Garnishes and optional ingredients are not included.