In a large pot, boil some water, heavily salt
Grind your peppercorns
Put the pasta in the pot
In a seperate pan, put your peppercorns in over medium heat. Let toast for a minute then ladle in a bit of the pasta cooking water.
In a seperate bowl, put your grated pecorino (reserve a little for garnish). Ladle in a little bit of pasta cooking water and stir to make a paste.
Once the pasta is 3/4 finished, transfer with tongs to the peppercorn/pasta water mixture. Add a little more pasta water as needed and toss around and finish cooking the pasta in this until is is al dente. Add pasta water as needed, a little at a time. Once done stir in your cheese mixture and toss until creamy.
Toss in arugula, put in a serving platter and sprinkle with a little more pecorino.
A little lemon is nice here if you like to serve.