Carbonara pasta

“Pasta alla carbonara is an Italian pasta dish based on eggs, pecorino romano, guanciale (un-smoked Italian pig's cheek bacon), and black pepper.”

http://en.wikipedia.org/wiki/Carbonara

My friend cooked for me one day. But I am not sure if he strictly follows the traditional receipt. Did he really use pig’s cheek bacon? But it was classic and tasty!

There is a receipt I found online:
http://www.seriouseats.com/recipes/2009/02/seriously-italian-pasta-alla-gricia-recipe.html