Meanwhile, bring a large pot of salted water to a boil over medium-high. Add pasta, and cook according to package directions for al dente, 9 to 11 minutes. Reserving 2 cups pasta cooking liquid, then ...
Avoid adding oil to the pasta water or the pasta itself after boiling. It can make the pasta greasy, and the sauce won't stick as well. Chop up some tomatoes and heat them in a pan. Add garlic, onion, ...