Prepare the egg and cheese mixture: In a small bowl, combine the egg yolks, freshly grated Pecorino Romano, and approximately 20 cracks of black pepper. Whisk until a thick, paste-like mixture forms. Set aside.

Cook the pasta: Bring a large pot of salted water to a boil. Add the pasta and cook until approximately 3 minutes shy of al dente. Reserve some pasta water before transferring the pasta.

Toast the black pepper: While the pasta cooks, add approximately another 20 cracks of freshly ground black pepper to the skillet with the reserved guanciale fat. Heat over medium until the pepper becomes fragrant and begins to toast.

Make the 'nduja sauce: Add the 'nduja to the skillet along with a ladle of pasta water. Stir until the 'nduja breaks down and combines with the water and rendered fat to form a sauce.

Add the pasta: Transfer the pasta to the skillet when it's approximately 3 minutes shy of al dente. Toss until fully coated in the 'nduja sauce.

Temper the eggs: While whisking the egg yolk and Pecorino mixture, slowly add approximately ½ ladle of hot pasta water until incorporated.

Finish the carbonara: Remove the skillet from the heat. Add the tempered egg and cheese mixture along with another ½ ladle of pasta water. Quickly toss until the pasta is evenly coated and the sauce becomes smooth and silky.

Adjust the consistency: If the sauce begins to tighten, add more pasta water a splash at a time, continuing to toss until the desired consistency is reached.

Serve: Plate the Carbonara Calabrese and finish with the reserved crispy guanciale, freshly cracked black pepper, and additional grated Pecorino Romano. Enjoy!