01 - Bring 4 cups of water to a boil in a large pot and add salt.
02 - Add spaghetti and cook until al dente, stirring occasionally. Reserve about 1 cup of the starchy pasta water before draining.
03 - In a large skillet over medium heat, toast the black pepper for 1 minute until fragrant.
04 - Add 1/2 cup of the reserved hot pasta water to the skillet with the pepper. Let simmer.
05 - In a large mixing bowl, combine grated Pecorino Romano with a few tablespoons of hot pasta water to form a thick paste.
06 - Add the cooked spaghetti to the skillet with pepper and toss well. Remove from heat.
07 - Gradually add the cheese paste to the pasta, tossing quickly and adding more reserved pasta water as needed to form a creamy, silky sauce that coats the noodles evenly.
08 - Serve immediately, topped with extra Pecorino Romano and a sprinkle of black pepper.