INGREDIENTS
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TART SHELL
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1 cup all-purpose flour
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1/4 teaspoon salt
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1/2 stick cold unsalted butter, cubed
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2 tablespoons cold vegetable shortening, scooped into teaspoon-size pieces
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3 tablespoons ice water
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FILLING
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4 ounces thickly sliced double-smoked bacon, cut crosswise into 1/4-inch strips
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1 small onion, halved and very thinly sliced
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1 teaspoon pure maple syrup
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3 tablespoons crumbled soft goat cheese
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2 tablespoons sour cream
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1 large egg
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1 egg yolk
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1/4 teaspoon ground allspice
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1 1/4 teaspoons fine sea salt
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1/4 teaspoon freshly ground white pepper
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1 cup heavy cream
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3/4 cup shredded Gruyère cheese