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1/2 of a 17.3-ounce package Pepperidge Farm® Puff Pastry Sheets (1 sheet), thawed
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1/4 cup Dijon-style mustard
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1 pound fresh asparagus, trimmed
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2 ounces prosciutto, cut into thin strips
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1 cup shredded Fontina cheese (about 4 ounces)
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1 tablespoon chopped fresh thyme leaves
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