Linguine with Spicy Sausage and Scallion Sauce

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Ingredients

1. 3/4 pound linguine
2. 4 scallions, cut into 1/2-inch lengths
3. 1/2 cup flat-leaf parsley
4. 2 tablespoons pine nuts
5. 1/4 cup plus 1 tablespoon extra-virgin olive oil
6. 1/2 cup freshly grated Parmigiano-Reggiano cheese, plus more for serving
7. Salt and freshly ground pepper
8. 3/4 pound hot Italian sausage (about 4 links), casings removed

1. In a large pot of generously salted boiling water, cook the pasta until just al dente. Drain the pasta, reserving 1 cup of the pasta cooking water.
2. Meanwhile, in a mini food processor, combine the scallions, parsley, pine nuts and 1/4 cup of the olive oil and process until pureed. Add the 1/2 cup of the cheese, season with salt and pepper and process the pesto just until blended.
3. In a large skillet, heat the remaining 1 tablespoon of olive oil. Add the sausage and cook over high heat, breaking up the meat with a wooden spoon, until it is lightly browned and no trace of pink remains, about 5 minutes. Drain the sausage and pour off any fat in the skillet.
4. Return the sausage to the skillet. Add the scallion pesto, pasta and 3/4 cup of the pasta cooking water and simmer over moderate heat, tossing, until a thick, creamy sauce forms, about 2 minutes; add more of the pasta cooking water if the sauce is dry. Transfer the pasta to bowls and serve, passing extra Parmigiano-Reggiano cheese on the side.