Step 1

Bring a large pot of water to a boil; add about 1 Tbs. salt. In a large skillet, heat the olive oil over medium-high heat. Cook the sausage, breaking up the lumps, until golden, about 5 minutes. Add the leeks and cook, stirring, until soft, about 8 minutes. Stir in the shallot and cook for 1 minute. Add 1 Tbs. of the butter, the peas, and the broth. Heat to a boil, reduce the heat to medium low, and simmer gently for 5 minutes. Season with salt and pepper, cover the skillet, and set aside; keep warm.

Step 2

Meanwhile, cook the campanelle, stirring occasionally, until al dente, about 12 minutes. Drain the pasta and return it to the pot over low heat. Add the sausage and leek sauce to the pasta and toss well. Remove the pot from the heat, add the remaining 1 Tbs. butter and the grated cheese; toss well. Transfer to a warmed serving platter or individual bowls. Serve immediately, with more grated cheese on the side, if you like.