INGREDIENTS
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Salt
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3 tablespoons olive oil
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2 to 3 ounces thinly sliced prosciutto, cut crosswise into 1/2-inch-wide strips
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1 pound pasta
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2 tablespoons butter
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1 shallot, minced
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Freshly ground black pepper
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2 cups fresh or frozen peas
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1 head Bibb or Boston lettuce (about 6 ounces), cored, leaves cut into 3/4-inch slices
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1/2 cup chicken or vegetable stock or dry white wine, plus more as needed
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1 cup finely grated Parmesan