Boil salted water and cook pasta 1-2 minutes less than package directions until al dente. Reserve 1 cup of hot pasta water before draining.
8 oz spaghetti or tonnarelli pasta, 1 tbsp salt, 1 cup pasta water
Toast cracked black peppercorns in a dry skillet over low heat for 45 seconds, stirring constantly until fragrant but not smoky. Remove from heat immediately.
1 tbsp black peppercorns
Add drained pasta to a large mixing bowl or the skillet off the burner. Toss with half the toasted pepper and a few tablespoons of reserved hot pasta water to loosen the pasta.
8 oz spaghetti or tonnarelli pasta, 1 tbsp black peppercorns, 1 cup pasta water
Gradually add finely grated Pecorino Romano cheese while tossing with tongs. Add reserved pasta water in small splashes continuously to create a creamy sauce that coats the pasta smoothly without clumping. Keep mixture moving off direct heat.
1 cup Pecorino Romano cheese, 1 cup pasta water
Adjust sauce consistency by adding more pasta water as needed. Taste and add remaining toasted pepper or more cheese if desired. Serve immediately while sauce is silky smooth.
1 cup Pecorino Romano cheese, 1 tbsp black peppercorns, 1 cup pasta water