"This tart celebrates the sweetness and caramelized goodness of three kinds of onions nestled in a buttery crust. With minimal prep time and cooking, you can indulge in the comforting taste of this savory treat in no time...."
INGREDIENTS
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1 1/4 cups all-purpose flour
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1/2 cup unsalted butter, cold and cubed
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1/4 teaspoon salt
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3-4 tablespoons ice water
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2 large yellow onions, thinly sliced
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1 large sweet onion, thinly sliced
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2 shallots, thinly sliced
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2 tablespoons olive oil
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1 tablespoon balsamic vinegar
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1 teaspoon granulated sugar
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Salt and black pepper to taste
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1/2 cup grated Gruyere cheese (or any preferred cheese)
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Fresh herbs, for garnish