Notes:
Guanciale is cured pig cheeks and a very common ingredient in the Lazio region of Italy. It is possible to find it in other places around the world but if you can't then use pancetta.
Buacatini is like thick spaghetti but it has a hole running all the way through it, a bit like a thin straw. It is one of the favoured pastas in Lazio and the hole allows the sauce to penetrate through the pasta as well as all around it...