The Roman original is just butter and parmesan. America added cream; we'll show you both.
Fettuccine Alfredo.
Per serving, worked out from the ingredient table.
Serve on warm plates with a twist of pepper and a little extra parmesan. Warm plates matter; the sauce sets as it cools.
What goes with Fettuccine Alfredo: a bread or rice, a side, something to drink and something sweet.