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    Golden Onion and Gruyère Tart

    clock-icon137 minutes
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    Pixicook editorial team

    A savory tart featuring caramelized onions and nutty Gruyère cheese in a creamy custard filling.

    Ingredients for Golden Onion and Gruyère Tart

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    units in
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    serves
    8 peoplechevron
    serves
    8 peoplechevron

    Pie Dough

    0 oz

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    Unsalted Butter

    0 oz

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    Onions, peeled and sliced thin

    0 oz

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    Salt

    to taste

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    Fresh Ground Black Pepper

    to taste

    Substitute chevron-down

    Half-and-Half

    cups

    Substitute chevron-down

    Eggs

    each

    Substitute chevron-down

    Egg Yolks

    each

    Gruyère Cheese, grated

    cups

    Substitute chevron-down

    Cayenne

    pinches

    Substitute chevron-down

    How to Make Golden Onion and Gruyère Tart

    1. Prepare the Tart Shell

    Begin by rolling out your pie dough into a 12-inch round. Gently place it into a 9-inch tart or pie pan, folding the edges to create double-thick sides, and pressing them firmly against the pan. Prick the bottom with a fork, then refrigerate for at least 1 hour to ensure it holds its shape.

    2. Blind Bake the Tart Shell

    Preheat your oven to 375°F. Once the dough is chilled, line the shell with foil or parchment paper and fill it with dried beans or pie weights. This blind-baking step is crucial as it helps the crust bake evenly and prevents puffing. Bake for about 15 minutes, until the edges are lightly golden. Carefully remove the weights and bake for an additional 5 to 7 minutes until the entire shell is evenly light golden brown.

    3. Caramelize the Onions

    While the tart shell bakes, melt 4 tablespoons of butter in a heavy-bottomed skillet over medium heat. Add the sliced onions, seasoning with salt and fresh-ground black pepper. Cook the onions, stirring frequently, for 20 to 30 minutes until they are soft and golden. This caramelization process is key to developing a deep, rich flavor. Once done, spread the onions out to cool slightly.

    4. Prepare the Custard Mixture

    In a bowl, mix together 1.5 cups of half-and-half, 2 eggs, 2 egg yolks, 0.5 cup of grated Gruyère cheese, a pinch of cayenne, and a bit more salt and pepper to taste. This custard mixture will bind the tart together while adding a creamy texture.

    5. Assemble and Bake the Tart

    Spread the cooled onions evenly over the baked tart shell. Carefully pour the custard mixture over the onions, ensuring it fills all gaps. Place the assembled tart back into the 375°F oven and bake for 35 to 40 minutes, or until the top is puffed and lightly golden.

    6. Cool and Serve

    Allow the tart to cool slightly before slicing. Serve warm or at room temperature, enjoying the harmony of sweet onions and nutty Gruyère in every bite.

    Variations

    Bacon and Leek Tart

    Sauté leeks until tender and golden, and add cooked, chopped bacon for a smoky flavor. Complement with a sharp cheddar cheese in the custard.

    Bacon or Pancetta

    For a non-vegetarian variant, add crispy bacon or pancetta to the tart to bring a salty and meaty dimension that pairs well with onions and cheese.

    Mushroom and Thyme Tart

    Replace the onions with a variety of sautéed mushrooms and thyme for an earthy flavor. Swap Gruyère for a milder cheese like Swiss or a bolder one like blue cheese depending on your preference.

    Caramelized Onions

    Consider caramelizing the onions for a longer period at a lower heat to coax out a deeper sweetness and add a rich, complex flavor to the tart.

    Roasted Red Pepper and Chorizo Tart

    Include strips of roasted red peppers and diced chorizo for a Spanish flair. Manchego cheese would work wonderfully here.


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