This classic from the tiny region of Molise on the Adriatic coast is simple and delicious, but the quality of the ingredients is important. The sauce is just diced guanciale with onion, garlic, basil, and parsley. You need good pancetta or guanciale, and fresh herbs work out better than dried herbs.
Unlike the fine folk of Molise, my usual diners are not so eager to scorch their tongues, so I left the chili pepper whole, and served it with a little homemade chili-infused olive oil. I got a little fire, not a raging bonfire. Feel free to chop your chili as you see fit!