1. Bring a large pot of salted water to a boil. Cook the spaghetti according to the package instructions until al dente.
2. While the pasta is cooking, heat a skillet over medium heat. Add the freshly ground black pepper and toast for about 1 minute.
3. Reserve 1 cup of pasta water, then drain the spaghetti.
4. Add the hot pasta to the skillet with the toasted pepper. Toss to combine.
5. Gradually add the grated Pecorino Romano cheese, tossing the pasta continuously. Add reserved pasta water a little at a time until a creamy sauce forms.
6. Serve immediately, garnished with additional cheese and black pepper if desired.
Notes:
For best results, use freshly grated Pecorino Romano cheese and freshly ground black pepper.