Coarse salt and ground pepper
12 ounces fettuccine
1 tablespoon butter
1 shallot, finely chopped (1/4 cup)
2/3 cup heavy cream (half and half or light cream work just as well, and are healthier)
1 package (10 ounces) frozen peas, thawed
8 slices prosciutto (about 4 ounces total), halved lengthwise and thinly sliced crosswise, about 1 cup
1 tablespoon finely grated lemon zest
1 tablespoon fresh lemon juice
1/2 cup finely grated Parmesan cheese, plus more for serving (optional)
1. In a large pot of boiling salted water, cook pasta until al dente, according to package instructions. Reserve 1 cup pasta water; drain pasta and return to pot.
2. Meanwhile, make sauce: In a large skillet, melt butter over medium-low heat; add shallot and cook until softened, about 5 minutes. Add cream, peas, and prosciutto; bring to a gentle simmer over medium heat. Simmer until peas are heated through, 3 to 4 minutes.
3. Stir in lemon zest and juice. Pour sauce over pasta; add Parmesan, and season generously with salt and pepper. Add enough reserved pasta water to thin sauce as desired. Serve immediately; top with additional Parmesan, if desired.