1. Cook the spaghetti in a large pot of salted boiling water until al dente.
2. Meanwhile, heat a large skillet over medium heat and toast the black pepper for 1-2 minutes.
3. Reserve 1 cup of pasta water and drain the spaghetti.
4. Add the spaghetti to the skillet with the black pepper. Gradually add the grated Pecorino Romano cheese, tossing the pasta with tongs and adding reserved pasta water as needed to create a creamy sauce.
5. Serve immediately, garnished with extra cheese and black pepper if desired.