Thick Spaghetti with Marinara Sauce, Arugula and Parmigiano Cheese

Bring a large pot of water to a boil.
In a large skillet saute onions in olive oil until lightly browned and cooked through. Add Barilla Marinara Sauce and bring to a simmer. Season with salt and pepper.
Cook pasta 2 minutes under cooking directions. Drain, reserving 1/2 cup cooking liquid.
Add pasta and cooking liquid to sauce. Cook pasta and sauce together for 2 minutes.
Once finished add arugula and stir to combine. Toss with cheese.