INGREDIENTS
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One 1 1/2-pound butternut squash—peeled, seeded and cut into 1/2-inch pieces
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1/4 cup extra-virgin olive oil
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Kosher salt and freshly ground pepper
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2 tablespoons unsalted butter
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1 large shallot, thinly sliced
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1 pound assorted mushrooms, trimmed and cut into 1-inch pieces
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1 teaspoon sherry vinegar
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1/4 teaspoon freshly grated nutmeg
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All-purpose flour, for dusting
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14 ounces chilled all-butter puff pastry
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2 large egg yolks
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1/4 cup crème fraîche
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1/4 pound Gruyère cheese, shredded
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2 teaspoons chopped thyme