Karamellisierte Zwiebeltarte (caramelized Onion Tart)

Karamellisierte Zwiebeltarte, or Caramelized Onion Tart, is a classic dish from Lower Saxon cuisine. This savory tart features a buttery crust filled with sweet and tender caramelized onions, creating a delicious combination of flavors.

Vegetarian Appetizer Lower Saxon Savory Tart Onion German
Karamellisierte Zwiebeltarte (caramelized Onion Tart)

Ingredients

  • 1 1/2 cups all-purpose flour
  • 1/2 teaspoon salt
  • 1/2 cup unsalted butter, cold and cut into small pieces
  • 3 large onions, thinly sliced
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/2 cup heavy cream
  • 2 large eggs
  • 1/2 cup grated Gruyère cheese

Instructions

  1. In a food processor, pulse the flour and salt. Add the cold butter and pulse until the mixture resembles coarse crumbs. Add 3-4 tablespoons of ice water and pulse until the dough comes together.
  2. Wrap the dough in plastic wrap and refrigerate for 30 minutes.
  3. Preheat the oven to 375°F (190°C).
  4. Roll out the dough on a floured surface and transfer it to a tart pan. Press the dough into the pan and trim any excess. Prick the bottom with a fork and bake for 15 minutes.
  5. While the crust is baking, heat the butter and olive oil in a large skillet over medium heat. Add the sliced onions, sugar, salt, and pepper. Cook, stirring occasionally, until the onions are caramelized, about 20-25 minutes.
  6. In a bowl, whisk together the heavy cream and eggs. Season with salt and pepper.
  7. Spread the caramelized onions over the pre-baked crust. Pour the cream mixture over the onions and sprinkle with grated Gruyère cheese.
  8. Bake the tart for 25-30 minutes, or until the filling is set and the crust is golden brown.
  9. Let the tart cool for a few minutes before slicing and serving.

Cooking & Preparation

Preparation time:
20 minutes
Cooking time:
45 minutes
Total time:
1 hour
Cooking method
Oven

Nutritional facts per 1 serving

Calories
320 per serving
Carbohydrates
35g
Protein
6g
Fat
18g

Supplies

Tart pan Food processor Skillet Bowl

Tools

Rolling pin Whisk Oven

Serving suggestions

Serve the Karamellisierte Zwiebeltarte as an appetizer or alongside a fresh green salad for a light lunch.

Tips & tricks

For extra flavor, you can add a sprinkle of fresh thyme or rosemary to the caramelized onions before baking the tart.

Cost

$12