Boil pasta per package or recipe directions.  Heat a large pan next to the pot of pasta.

Grate the cheese (I used the Cheese Guy's Pecorino with pepper) and set aside.

When pasta is done cooking to al dente, transfer to hot pan using tongs or pasta spoon and a spoonful of pasta water.  Add cheese and butter, stir and add more pasta water as necessary to achieve desired consistency.  Add pepper and adjust seasoning to taste.  Serve right away with more grated pecorino if desired.