Preparation
Bring a large pot of water to a boil for pasta, salt water and cook pasta to al dente.
While the pasta water comes to a boil, place a medium pot over medium-low heat with 2 turns of the pan of EVOO, about 2 tablespoons, and the butter. Add the onion and garlic to the pan and cook the veggies until very soft, about 10 minutes. Then heat the broiler and position rack in the middle of the oven.

