Rustic Walnut Rapini Pasta

Directions

1. 1
   In large skillet, brown sausage meat over medium-high heat, breaking up pieces with the back of a spoon.
2. 2
   Add onion and cook until softened, about 5 minutes.
3. 3
   Stir in garlic and cook for 1 minute.
4. 4
   Stir in walnuts.
5. 5
   Meanwhile, cook pasta according to package directions.
6. 6
   Add rapini during the last minute of cooking.
7. 7
   Reserve 1/2 cup of the pasta water in a measuring cup.
8. 8
   Drain pasta and rapini in a colander.
9. 9
   Add reserved pasta water, lemon zest, and Parmesan cheese in the walnut mixture.
10. 10
    Stir in pasta and rapini.
11. 11
    Serve with additional Parmesan cheese and chili flakes, if desired.