First, heat some olive oil in a large sauté pan over medium-low heat. Add guanciale strips to the pan and cook until it is crispy (about 10-15 minutes). Meanwhile, cook your pasta in unsalted boiling water until 2 minutes before al dente.
Continue to stir guanciale occasionally to prevent burning. Meanwhile, prepare your egg mixture. Crack 1 whole egg + 3 egg yolks and place in a mixing bowl. Whisk together. Then, add pecorino romano and whisk again to form a thick, creamy paste. Finally, add about half a ladleful of pasta water and mix.
Once guanciale is nice and crispy, remove some from the pan and set it aside for garnish later. Add your crushed red pepper flakes in (optional). Add about a ladleful of pasta water to the pan and then add in your cooked noodles. Mix and toss to coat the pasta in the delicious pork fat. Remove from heat.
Once off the heat, pour the egg mixture into the pan and immediately mix to combine. Toss well a couple of times to fully coat pasta with the creamy sauce.
Plate it up. Garnish with crispy guanciale bits, some more pecorino romano and a few cranks of freshly ground black pepper. Enjoy!