Cook the pasta according to the instructions on the box, until al dente.
In a skillet, gently sauté the pancetta until crispy.
While the pasta and the pancetta cook, in a medium mixing bowl, combine the two whole eggs and the two yolks with the Parmigiano Reggiano and black pepper, then whisk until fully combined.
Remove the pancetta from the heat.
Remove the pasta from the water directly into the pan with the pancetta, and stir to combine fat with the pasta. Reserve the pasta water.
Once the pasta and pancetta fat are thoroughly combined, add the egg mixture, and continue to stir to emulsify. If the mixture becomes too thick, add pasta water 1/2 cup at a time to assist in emulsification and thin the sauce
If the sauce becomes too thin and watery, put the pan back on low heat and gently stir until you've reached the desired sauce consistency.
Serve immediately, garnish with more Parmesan and black pepper.
Pro tip: This dish is typically made with a cured pork product called guanciale. While this is optimal, pancetta is a great substitute. If you can't find either, use a nice bacon.