Cozy Caramelized Onion Tart Recipe

Cozy Caramelized Onion Tart Recipe

October 2, 2025 Written by Amelia

Today’s Dish: Caramelized Onion and Thyme Tart

As the weather starts to cool down and the leaves change colors, I find myself craving cozy dishes that are full of flavor. Today, I’m excited to share with you a recipe for a Caramelized Onion and Thyme Tart that is sure to impress your taste buds with its rich and savory combination of ingredients.

Ingredients:

  • store-bought puff pastry (1 sheet, thawed)
  • yellow onions (4, thinly sliced)
  • fresh thyme leaves (1 tablespoon, chopped)
  • balsamic vinegar (2 tablespoons)
  • brown sugar (1 tablespoon)
  • butter (2 tablespoons)
  • olive oil (1 tablespoon)
  • salt (to taste)
  • black pepper (to taste)

Kitchen Tools:

  • rolling pin
  • frying pan
  • oven
  • knife

I start by preheating the oven to 400°F (200°C) and rolling out the thawed puff pastry sheet into a rectangular shape on a lightly floured surface. I transfer the pastry to a baking sheet lined with parchment paper and using a knife, I score a border around the edges about 1 inch from the edge.

In a frying pan over medium heat, I heat the olive oil and butter until melted. Then, I add the sliced onions, salt, and pepper, cooking them slowly until they are caramelized and golden brown. This process usually takes about 20-25 minutes.

Next, I stir in the balsamic vinegar, brown sugar, and chopped fresh thyme, cooking for an additional 2-3 minutes until everything is well combined and fragrant. I then spread the caramelized onion mixture evenly over the puff pastry, staying within the scored border.

I bake the tart in the preheated oven for 20-25 minutes, or until the pastry is golden brown and crisp. Once out of the oven, I let it cool slightly before slicing into squares or rectangles for serving.

The total weight of the cooked tart is approximately 800 grams, with 8 servings at around 100 grams each. Each serving is estimated to be around 300 calories.

One unique tip for this recipe is to sprinkle some crumbled goat cheese over the top of the tart before baking for an extra layer of flavor and creaminess.

I hope you give this Caramelized Onion and Thyme Tart a try and enjoy the warm and comforting flavors it brings to your table. Feel free to customize it with your favorite herbs or cheeses to make it your own!

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