1Toast peppercorns until fragrant then coarsely grind and save 2g for later.
2Heat a pot of water for the pasta using just enough water to cover the pasta to concentrate the starch.
3Whisk 4 egg yolks, grated cheeses, and the saved 2g of black pepper in a metal bowl.
4Place the metal bowl on top of the heated pot of water and whisk until the color and density changes to become smooth.
5Add the guanciale to a cold pan without oil and cook over low-medium heat until the fat renders, then remove the guanciale and save the fat.
6Cook the spaghettoni until very al dente.
7Add the cooked pasta to the metal bowl with the egg and cheese mix and add 2-4 spoonfuls of the guanciale fat, along with enough pasta water to emulsify and achieve the desired consistency.
8Mix vigorously to emulsify then add in the guanciale.
9Serve with grated pecorino romano and a few pinches of the freshly ground black pepper.