Caramelized Onion Tart

A delightful tart featuring a flaky crust filled with sweet caramelized onions, creamy cheese, and fresh herbs, perfect for gatherings.

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Prep Time 30

Cook Time 40

Total Time 1 10

Servings: 4 servings

Course: Appetizer, Main Course

Cuisine: French

Calories: 350

Ingredients Method Nutrition Notes

Ingredients

For the Tart Crust

1 1/4 cups all-purpose flour Use whole wheat flour for a nuttier flavor.
1/2 teaspoon salt Kosher salt is preferred.
1/2 cup unsalted butter (cold, cubed) Can substitute with margarine for a dairy-free option.
3 tablespoons ice water Helps bind the dough together.

For the Caramelized Onions

3 large onions (sliced thin) Sweet onions like Vidalia or Walla Walla work best.
2 tablespoons olive oil Butter can be mixed in for added richness.
1 tablespoon balsamic vinegar Red wine vinegar is a good substitute.
Salt and pepper to taste Add a pinch of each while cooking.

For the Filling

3 large eggs Can replace with flax eggs for vegan options.
1 cup heavy cream Half-and-half can be used for a lighter version.
1 cup grated Gruyère cheese Swiss cheese works well as an alternative.
1 teaspoon fresh thyme leaves Or 1/2 teaspoon dried thyme.

Method

Preparation

Preheat your oven to 375°F (190°C).
Sauté the onions in a skillet with olive oil over medium heat for about 15-20 minutes until soft and golden brown.
Prepare the crust by rolling out your pastry dough on a floured surface and fit it into a tart pan.
Blind bake the crust by placing parchment paper over it and filling with pie weights. Bake for 10 minutes at 375°F (190°C).
Combine the sautéed onions with fresh herbs, cheese, and eggs in a mixing bowl. Stir until well combined.
Fill the pre-baked crust with the onion mixture evenly.
Bake in the preheated oven for an additional 25-30 minutes.

Nutrition

Serving: 1servingCalories: 350kcalCarbohydrates: 30gProtein: 8gFat: 25gSaturated Fat: 15gPolyunsaturated Fat: 2gMonounsaturated Fat: 8gCholesterol: 150mgSodium: 400mgPotassium: 200mgFiber: 2gSugar: 3gVitamin A: 500IUVitamin C: 5mgCalcium: 150mgIron: 1mg

Notes

This tart can be prepared ahead of time and reheated, making entertaining easy.

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