"Earthy mushrooms and bits of salty ham stud this silky baked pasta dish withbursts of flavor. If you cannot find thin, straight-edged no boil lasagna sheets atyour market, try a shop that specializes in Italian foods. You don’t want rufflededges on this rustic dish...."
INGREDIENTS
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1/2 cup unsalted butter, plus more for greasing
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Sea salt and freshly ground white pepper
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1/2 cup unbleached all-purpose flour
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4 tablespoons olive oil, plus more if needed
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1/2 teaspoon freshly grated nutmeg
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1 small leek, white and tender green parts only, thinly sliced
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4 cups whole milk
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3/4 pound white mushrooms, brushed clean and sliced
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1 cup chicken stock or low-sodium broth
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1/2 pound thinly sliced prosciutto, chopped
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1/2 cup Marsala
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2 tablespoons chopped fresh basil
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2 large eggs, lightly beaten
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12 sheets no-boil lasagna, each about 7 by 31/2 inches