In a medium bowl, whisk together the eggs, 1/2 cup of the Parmesan, and
a generous dose of freshly cracked pepper.
The water should be boiling at this point, so add the pasta, stir well,
and continue to boil the pasta until al dente. Reserve one cup of the
starchy pasta cooking water, then drain the pasta in a colander
Add 1/4 cup of the reserved pasta water to the skillet that was used to
cook the bacon. Stir the warm water in the skillet and dissolve the
browned bits from the surface of the skillet. Add the steaming hot
drained pasta to the skillet and toss in the bacon liquid in the
skillet.
Pour the egg and Parmesan mixture over the hot pasta and immediately
begin to stir or toss the pasta. Continue to stir the hot pasta in the
egg mixture until a creamy sauce forms. Add the remaining Parmesan, a
little more freshly cracked pepper, and the reserved bacon bits, and
toss again. If the pasta becomes too thick or dry, add a splash more of
the reserved pasta water.
Finally, taste the pasta and adjust the salt, Parmesan, or pepper if
needed. Top with a pinch or two of roughly chopped parsley leaves.