I. Also known as pasta in bianco or fettuccine al burro. To make it cacio e pepe, use Romano cheese and a generous amount of freshly ground black pepper.
Cook in a large pot of boiling salted water:
Reserve ½ cup of the pasta water. Drain the pasta, transfer to a serving bowl or back to the pasta cooking pot, and toss with the pasta water and:
II. Fettuccine Alfredo
Cook the pasta as for I. While the pasta is cooking, melt in a large skillet over medium heat:
Drain the pasta and add it to the skillet along with:
Toss over low heat until the pasta is well coated.