"Add the prosciutto at the last minute to preserve the pretty pink color...."
INGREDIENTS
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1/2 pound pappardelle or fettuccine
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Kosher salt
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2 tablespoons olive oil
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2 tablespoons unsalted butter
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2 leeks, white and pale greens only, halved lengthwise, thinly sliced crosswise
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1/4 cup chopped fresh chives
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2 teaspoons finely grated lemon zest plus more for serving
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1 bunch arugula, thick stems trimmed, leaves torn (about 4 cups)
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1/3 cup finely grated Parmesan plus more for serving
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Freshly ground black pepper
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3 ounces prosciutto, torn into 1" pieces