Pasta, pecorino romano, black pepper and the pasta's own starchy water, whisked into a creamy sauce.
What makes it cacio e pepe
Only pecorino, pepper, pasta and its water.
The pepper toasted first.
Emulsified off the heat, never clumped.
Where it comes from
A shepherds' dish: pecorino and dried pepper kept well on the move. With only three ingredients it's famously easy to get wrong — too hot and the cheese clumps — so it has become a test of a Roman cook's hand.