How to Make It
Cook pasta according to package directions. Meanwhile, in a large frying pan over medium-high heat, brown sausages in oil, stirring to break up, about 5 minutes. Add shallot and garlic and cook until fragrant, about 1 minute. Pour in vinegar and scrape pan to loosen browned bits. Add broccoli rabe, sprinkle with 1/4 teaspoon salt and the pepper, and cook, covered, until bright green and tender-crisp, about 2 minutes.
Drain pasta, reserving 1/2 cup cooking water. Return pasta to pot, then add sausage mixture. Add a little reserved water if pasta seems dry. Season with salt to taste and serve with Parmesan.
Use hot Italian sausages for a bit of kick, or stick with mild sausages and serve red chile flakes on the side so people can sprinkle on exactly as much as they want.