pasta w/ peas, asparagus, butter lettuce, and prosciutto

Pasta w/ Peas, Asparagus, Butter Lettuce, & Prosciutto
adapted from Bon Appetit, April 2009
6 servings (or less if you just can't stop!)

ingredients
2 tablespoons (1/4 stick) butter
2 tablespoons extra-virgin olive oil plus additional for drizzling
1/2 pound spring onions or green onions (dark green parts discarded); white parts cut into 1/4-inch-thick slices, pale green parts cut into 1/2-inch-thick slices (I used spring onions)
2 tablespoons minced shallot
Coarse kosher salt
1/2 cup dry white wine
1/2 cup low-salt chicken broth
1 1/2 pounds asparagus, cut crosswise into 3/4-inch pieces
2 cups shelled fresh peas (from about 2 pounds peas in pods) or 2 cups frozen petite peas, thawed
1 pound campanelle (trumpet-shaped pasta) or medium (about 1-inch) shell-shaped pasta
1 head of butter lettuce or Boston lettuce (about 6 ounces), cored, leaves cut into 3/4-inch-wide slices
1 cup finely grated Parmesan cheese plus additional for sprinkling
1/2 cup chopped fresh Italian parsley
4 oz thinly sliced prosciutto, cut crosswise into 1/2-inch-wide strips

instructions
Melt butter with 2 tablespoons oil in heavy large skillet over medium heat. Add onions and shallot. Sprinkle with coarse salt and pepper. Sauté until tender (do not brown), about 8 minutes. Add wine; increase heat to medium-high and simmer until liquid is reduced to glaze, about 3 minutes. Add broth and bring to simmer; set aside.

Cook asparagus in large pot of boiling salted water until just tender, 2 to 4 minutes, depending on thickness of asparagus. Using skimmer or slotted spoon, transfer to large bowl of ice water. Return water to boil. Add peas and cook until just tender, about 2 minutes. Using skimmer, transfer to bowl with asparagus. Drain vegetables.

Return water in pot to boil. Cook pasta until tender but still firm to bite, stirring occasionally. Drain, reserving 1 cup pasta cooking liquid.
Meanwhile, reheat onion mixture. Add drained asparagus and peas; stir until heated through. Remove from heat.
Add pasta, 1 cup Parmesan cheese, lettuce and parsley to skillet with vegetables; toss, adding reserved pasta cooking liquid by 1/4 cupfuls if dry. Season with salt and pepper.
 
Transfer pasta to large shallow bowl. Sprinkle prosciutto over; drizzle with olive oil. Serve, passing more cheese alongside.