INGREDIENTS
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DOUGH
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1 1/4 cups (6 1/4 ounces) all-purpose flour
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1/2 cup (2 3/4 ounces) whole-wheat flour
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1 tablespoon sugar
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3/4 teaspoon salt
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10 tablespoons unsalted butter, cut into 1/2-inch pieces and chilled
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7 tablespoons ice water
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1 teaspoon white vinegar
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FILLING
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1 1/4 pounds shiitake mushrooms, stemmed and sliced thin
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5 teaspoons olive oil
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1 pound leeks, white and light green parts only, sliced 1/2 inch thick and washed thoroughly (3 cups)
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1 teaspoon minced fresh thyme
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2 tablespoons crème fraîche
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1 tablespoon Dijon mustard
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Salt and pepper
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3 ounces Gorgonzola cheese, crumbled (3/4 cup)
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1 large egg, lightly beaten
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kosher salt
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2 tablespoons minced fresh parsley