"If lasagna is just a layered noodle casserole, there's no reason to stand on ceremony. Here's a vegetarian, autumnal version with butternut squash, leeks, pine nuts and Parmigiano-Reggiano...."
INGREDIENTS
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10 lasagna noodles
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2 unsalted butter
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4 large or 5 medium leeks
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1/2 all-purpose flour
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4 nonfat milk
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1 dried thyme
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1 salt
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3/4 freshly grated nutmeg
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1/2 freshly ground pepper
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1 2-pound butternut squash
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6 Parmigiano-Reggiano
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1/4 toasted pine nuts