01 - Bring 4 cups of water to a rolling boil in a large pot. Stir in the salt until dissolved.
02 - Add spaghetti to the boiling water. Cook until al dente, stirring occasionally to prevent sticking. Reserve about 1 cup of the starchy pasta water before draining.
03 - While pasta cooks, place a large skillet over medium heat. Add the freshly ground black pepper and toast for 1 minute until fragrant, swirling the pan occasionally.
04 - Pour 1/2 cup of the reserved hot pasta water into the skillet with the toasted pepper. Let simmer gently.
05 - In a large mixing bowl, combine the grated Pecorino Romano with a few tablespoons of hot pasta water. Mix vigorously with a fork until a thick, smooth paste forms.
06 - Transfer the cooked spaghetti to the skillet with the pepper-infused water. Toss thoroughly using tongs. Remove from heat.
07 - Gradually add the cheese paste to the pasta, tossing rapidly and constantly. Add more reserved pasta water as needed to achieve a silky, creamy sauce that coats each strand evenly.
08 - Divide between two warmed bowls. Top with additional grated Pecorino Romano and a fresh grinding of black pepper. Serve immediately while hot.