Onion tart

This onion tart features caramelized red onions and red peppers with a parmesan crust, enhanced by fresh thyme for a delicious, savory dish. Perfect as an appetizer or light meal, it combines simple ingredients into a satisfying tart.

03 Dec 2025
Cook time 60 min
Prep time 60 min

Ingredients:

1.50 cups all-purpose white wheat flour
3/4 cup grated parmesan cheese
1/2 cup olive oil
2 red onions
1 red pepper
1 tbsp fresh thyme
2 tsp brown sugar
2 tbsp vinegar
Onion tart

This delicious onion tart brings together the sweetness of caramelized red onions, the sharpness of parmesan cheese, and the aromatic touch of fresh thyme. It's a perfect appetizer or a light meal that combines simple ingredients into a sophisticated and tasty dish.

Instructions:

1. Preheat Oven:
Preheat your oven to 375°F (190°C).
2. Prepare the Crust:
- In a medium mixing bowl, combine the all-purpose white wheat flour and grated parmesan cheese.
- Gradually add the olive oil while mixing until the dough comes together. If the dough is too crumbly, you can add a small amount of cold water, a teaspoon at a time, until it holds together.
- Press the dough evenly into the bottom and up the sides of a tart pan. Use your fingers to smooth it out.
- Prick the bottom of the crust with a fork several times to prevent it from bubbling up during baking.
- Bake the crust in the preheated oven for about 10-12 minutes, or until lightly golden. Remove and set aside.
3. Prepare the Filling:
- While the crust is baking, peel and thinly slice the red onions. Cut the red pepper into thin strips.
- Heat a large skillet over medium heat and add a tablespoon of olive oil.
- Add the sliced onions and red peppers to the skillet. Cook, stirring occasionally, until they start to soften, about 5-7 minutes.
- Sprinkle the brown sugar over the onion mixture and continue to cook, stirring occasionally, until the onions are caramelized and golden brown, about 15-20 minutes.
- Stir in the fresh thyme and vinegar, cooking for an additional 2-3 minutes. Season with salt and pepper to taste. Remove from heat.
4. Assemble the Tart:
- Spread the caramelized onion and pepper mixture evenly over the pre-baked tart crust.

5. Bake the Tart:
- Return the assembled tart to the oven and bake for an additional 15-20 minutes, or until the edges of the crust are golden and the filling is set.
6. Serve:
- Remove the tart from the oven and let it cool slightly before slicing.
- Serve warm or at room temperature.

In just a few steps, you've created a beautiful and flavorful onion tart that is sure to impress. This dish is not only a feast for the eyes but also a delight for the taste buds, combining savory and sweet flavors that make it a standout option for any meal. Enjoy your culinary creation!

Onion tart FAQ:

What is the baking time for the onion tart?

The onion tart requires a total baking time of about 25-32 minutes. First, bake the crust for 10-12 minutes until lightly golden. Then, bake the assembled tart for an additional 15-20 minutes until the edges are golden and the filling is set.

How do I know when the onions are caramelized?

Onions are caramelized when they turn golden brown and develop a sweet flavor. In this recipe, you should cook the onions and red peppers for about 15-20 minutes after adding brown sugar, stirring occasionally to prevent burning.

Can I make this onion tart ahead of time?

Yes, you can prepare the onion tart ahead of time. After assembling, you can refrigerate it before baking. When ready to serve, bake it straight from the fridge, adding a few extra minutes to the baking time to ensure it heats through.

What can I substitute for parmesan cheese in the crust?

If you need a substitute for parmesan cheese, you can use pecorino romano for a similar flavor or nutritional yeast for a dairy-free option. However, this may slightly alter the taste and texture of the crust.

What size tart pan should I use for this recipe?

A standard tart pan that is 9 to 10 inches in diameter works well for this onion tart recipe. If you use a different size, be mindful that baking times may vary.

Tips:

- Use cold olive oil to make the dough for a flakier texture.

- Slice the onions and red pepper thinly for even cooking.

- Caramelize the onions slowly over low heat to bring out their natural sweetness.

- Use a tart pan with a removable bottom for easier serving.

- Let the tart cool slightly before cutting to ensure clean slices.

Nutrition per serving

8 Servings
Calories 140kcal
Protein 6g
Carbohydrates 24g
Fiber 2.06g
Sugar 3.54g
Fat 18g

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