Bring 4-5 quarts of water to a boil in a large saucepan or pot and add 1 tablespoon salt. Add the pasta and cook according to package directions until al dente (usually about 10 minutes.) Scoop out 3/4 cup of the cooking water before draining the pasta.
Next, within the last 5 minutes of cooking the pasta, Temper the eggs to create the creamy sauce. Please read the tips on how to.
Start whisking the egg yolks, whole egg, cheese, salt and black pepper in a large mixing bowl. If you have a large pasta serving bowl, use that to mix and serve. Scoop out 1/2 cup of the cooking water before draining the pasta.
Add the hot water into the egg yolk mixture — this tempers the eggs so they won't scramble.
Immediately dump the hot pasta into the bowl, then toss it all together quickly and thoroughly, using tongs or two spoons. You can add more water if the sauce seems dry.
Sprinkle the bacon and parsley over the pasta and toss to combine. Serve right away, with additional grated cheese on the side. I also add lemon juice and grated lemon zest at serving time. This is optional, but highly recommended.