For a truly authentic taste, use guanciale. Pancetta is a good substitute if guanciale is unavailable. Ensure your Pecorino Romano is good quality. The key is to combine the hot pasta with the egg mixture OFF the heat, using reserved pasta water to create a creamy, emulsified sauce and prevent the eggs from scrambling.
Keyword carbonara, spaghetti, guanciale, pecorino romano, italian pasta, egg sauce, classic italian