Place a large pot of water to boil, making sure to a handful of salt.  Once boiling, throw in rigatoni and cook for approximately 7-8 minutes, or until the pasta is al dente.

In the meantime, heat up an iron pan and add chopped guanciale.  Once the fat is practically melted away, add pomodoro. Note:  you do not need to add any olive oil at all.  Allow the guanciale/tomato mixture to cook down while gently break apart the peeled tomatoes by mixing with a wooden spoon.  

Once the pasta is cooked, remove from water, and make sure to save a cup of the pasta water on the side. Add pasta to guanciale and tomato mixture, followed by pecorino. Mix together and add a slight amount of cooked pasta water. Continue to mix for about 2 minutes.  Plate and garnish with a generous amount of grated pecorino.