Rigatoni with Sausage & Zucchini

I found this one here, via stephmodo.com
I really enjoyed this one and I went a little easy on the zucchini, but didn't need to. My family loved it! I did use less cheese than indicated in this recipe and it was great!

1 16 oz. box of rigatoni (I prefer Barilla or De Cecco)
2 tablespoon olive oil
1/2 lb. best-quality mild Italian sausage, casings removed (you can buy it without casings at the farmer's market)
1 1/2 tablespoons minced garlic*
1 medium red onion, halved and then sliced
1 lb. zucchini, sliced into 1/4 inch rounds (about 3 small)
sea salt + freshly ground pepper
1 cup freshly grated Parmigiano-Reggiano

1. Cook pasta in a stockpot according to package directions. Drain, return to pot, and set aside.

2. Meanwhile, in a large skillet (preferably cast-iron), heat olive oil over medium-high heat. Add sausage and cook, stirring often, until cooked through, about 5 minutes. Transfer sausage to a plate and set aside.

3. In the same pan, cook garlic, onion, and zucchini until starting to brown, about 4 minutes. Sprinkle with pepper and reserved sausage then cook until heated through, about 3 minutes.

4. Pour the sausage mixture into the stockpot full of reserved pasta and carefully toss. Mix in about 1/2 of the Parmigiano-Reggiano cheese and then sprinkle the remainder on top just before serving. Enjoy immediately!