Boil the spaghetti in salted water until it is al dente. Drain and set aside.
Beat the eggs. Add the black pepper and cheese to the beaten eggs. Set aside. Add cream to this mixture, if desired, for a creamier dish.
Put the oil in a saucepan with the pancetta, and saute for 5 minutes. Add the spaghetti into the pan and saute for another 3 minutes.
Turn off the flame (this is important) and add the egg and cheese mixture to the pasta and mix. Serve with additional Pecorino Romano on top.
Recipe courtesy of Enoteca Corsi, Rome, Italy