Heirloom Tomato Tart
INGREDIENTS
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For the tart dough:
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2 cups all-purpose flour
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1 teaspoon grated lemon zest
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3/4 teaspoon salt
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10 tablespoons cold salted butter, cut into chunks
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2 tablespoons heavy cream
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2-4 tablespoons ice water
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For the filling:
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1 medium sized yellow onion, peeled, halved, and cut into thin slices
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1/4 teaspoon salt
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1/8 teaspoon ground black pepper
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3 tablespoons unsalted butter
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6 sprigs fresh thyme
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1/4 cup heavy cream
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1 cup grated Gruyere cheese
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2 -3 large heirloom tomatoes
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