In a large pan add diced Guanciale and sauté until golden and crispy.
Remove the golden crispy Guanciale and set aside. Keep the released fat from the Guanciale in the pan.
Heat olive oil in a new large skillet over medium heat.
Add sliced chili peppers to the skillet and cook briefly.
Pour in the crushed tomatoes and season with salt to taste.
Simmer the sauce for about 15-20 minutes, stirring occasionally.
Bring a large pot of salted water to a boil.
Cook the bucatini or spaghetti according to package instructions until al dente.
Reserve about 1 cup (250ml) of pasta cooking water, then drain the pasta..
Heat up the pan with the Guanciale fat and add the cooked pasta to the skillet with the Amatriciana sauce.
Toss the pasta untill evenly coated with the Guanciale fat.
Add the cooked pasta to the pan with the Amatriciana sauce.
Toss well to coat the pasta evenly with the sauce.
If needed, add a splash of reserved pasta water to loosen the sauce.
Divide the pasta with Amatriciana sauce into bowls or plates.
Garnish generously with grated Pecorino Romano cheese and the golden crispy Guanciale cubes.
Enjoy this classic Roman dish with a glass of Italian red wine.