"The filling for these turnovers also makes a terrific side dish on its own...."
INGREDIENTS
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One 3-pound butternut squash, halved lengthwise and seeded
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Salt and freshly ground pepper
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1 medium sweet onion, sliced 1/2 inch thick
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1 1/2 cups shredded Gruyère cheese (5 ounces)
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1 teaspoon finely chopped thyme
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All-purpose flour, for rolling out the pastry
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Flaky Turnover Pastry
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Egg wash made wth 2 large egg yolks lightly beaten with 2 tablespoons whole milk