This is how you make fettuccine Alfredo like the Romans. It’s an incredibly simple and quick dish with only a few key ingredients: pasta, butter, and cheese. The result is impressively elegant and rich, and loaded with the flavors of sweet, young Parmigiano-Reggiano cheese and golden butterfat. The key is to use the starchy pasta-cooking water to form a smooth, creamy, emulsified sauce…minus the cream. Get Recipe!