Author Notes
This decadent tart is packed with caramelized onions, roasted butternut squash, Gruyère and crème fraîche. It makes an excellent vegetarian main or a rich, savory side. —Vanessa Larson
Test Kitchen Notes
WHO: Vanessa Larson is a brand-new member of the Food52 community. Welcome!
WHAT: A rich, salty, savory tart with as much melty cheese as there are roasty onions and squash.
HOW: Caramelize onions with butter and thyme, then combine with roasted squash in a pre-baked tart shell. Pour a cheesy, savory custard over the vegetables and bake until bubbly and golden.
WHY WE LOVE IT: Caramelized onions, roasted butternut squash, Gruyère, and crème fraîche—it literally could not be bad. We like the addition of whole wheat flour to the crust, as it adds a little extra heft. Our only complaint is that we ate too much of the squash before putting it in the tart—maybe the recipe should suggest roasting extra? (Just kidding. Mostly.) —Food52
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Watch This Recipe
Caramelized Onion & Butternut Squash Tart
Ingredients
- Caramelized Onion & Butternut Squash Tart
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1
recipe pastry dough (see below)
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1
large butternut squash, peeled, seeded, and cubed
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1 tablespoon
olive oil
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2
large yellow onions, halved and sliced
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3 tablespoons
unsalted butter
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2
eggs
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8 ounces
crème fraîche
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4 ounces
Gruyère, grated
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2 ounces
Parmesan, grated
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1 teaspoon
sea salt
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1 teaspoon
freshly ground black pepper
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4
sprigs thyme
- Pastry Dough
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3/4 cup
all-purpose flour
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1/2 cup
whole wheat flour
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1/4 teaspoon
kosher salt
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8 tablespoons
unsalted butter
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4 tablespoons
ice water
Directions
- Caramelized Onion & Butternut Squash Tart
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Melt butter in large saucepan over medium heat. Add onions, thyme sprigs, and 1/2 teaspoon salt, stirring to mix. Cover and reduce heat to low. Cook, stirring occasionally, until dark golden brown, about 45 minutes. Remove thyme stems.
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Meanwhile, preheat oven to 450° F. Toss butternut squash with olive oil and 1/2 teaspoon salt and spread out on baking sheet. Bake until browned and very soft, stirring once, about 40 minutes.
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Reduce oven heat to 350° F. Roll dough out until thin and press into a well-greased 10-inch tart pan. Prick all over with a fork and bake in oven 10 minutes.
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In a medium mixing bowl, combine eggs, crème fraîche, gruyère, Parmesan, and black pepper.
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Spread caramelized onions in bottom of tart and top with butternut squash. Pour gruyère mixture over the squash, making sure to spread it evenly throughout the tart.
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Bake until golden brown and cooked through, about 30 to 40 minutes.
- Pastry Dough
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Cut butter into 1-tablespoon pieces and freeze for 10 minutes.
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Mix flour and salt in food processor or large bowl.
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If using food processor, add butter and mix until mixture resembles small pea-sized balls. If mixing by hand, work quickly, mixing the butter in with your hands until it forms small pea-sized balls.
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Add in ice water and mix just until dough forms and comes together. Form into disk, wrap in plastic, and place in fridge for 20 minutes.
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