This dish is a deli egg-bacon-and-cheese-on-a-roll that has been pasta-fied, fancified, fetishized and turned into an Italian tradition that, like many inviolate Italian traditions, is actually far less old than the Mayflower. Because America may have contributed to its creation, carbonara is Exhibit A in the back-and-forth between Italy and the United States when it comes to food. Remember: the main goal is creaminess.
Salt
2 large eggs and 2 large yolks, room temperature
1 ounce (about 1/3 packed cup) grated pecorino Romano, plus additional for serving
1 ounce (about 1/3 packed cup) grated Parmesan
Coarsely ground black pepper
1 tablespoon olive oil
3 ½ ounces of slab guanciale (see recipe), pancetta or bacon, sliced into pieces about 1/4 inch thick by 1/3 inch square
12 ounces spaghetti (about 3/4 box