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 cooking water before draining.
03 - While pasta cooks, add black pepper to a large skillet over medium heat. Toast for 1 minute until fragrant, stirring constantly.
04 - Pour 1/2 cup of the reserved hot pasta water into the skillet with the toasted pepper. Let simmer briefly to infuse the flavors.
05 - In a large mixing bowl, combine grated Pecorino Romano with a few tablespoons of hot pasta water. Mix vigorously until a thick, smooth paste forms.
06 - Transfer the cooked spaghetti to the skillet with the pepper-infused water. Toss thoroughly to coat evenly. Remove from heat.
07 - Gradually incorporate the cheese paste into the pasta, tossing rapidly. Add more reserved pasta water as needed to achieve a creamy, silky sauce that clings to each strand.
08 - Plate the pasta while hot. Garnish with additional grated Pecorino Romano and a generous sprinkle of freshly ground black pepper.