INGREDIENTS
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Kosher salt
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Good olive oil
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3/4 pound dried lasagna noodles
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4 cups whole milk
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12 tablespoons (11/2 sticks) unsalted butter, divided
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1/2 cup all-purpose flour
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1 teaspoon freshly ground black pepper
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1 teaspoon ground nutmeg
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1 1/2 pounds portobello mushrooms
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1 cup freshly ground Parmesan