Pecorino Romano is a well known and distinctive Tuscan cheese made from 100% sheep’s milk. It is sometimes used interchangeably in recipes with the more mild Parmesan. However due to Pecorino’s stronger flavor profile, this isn’t really an ideal swap.
Here, the stronger flavor of Pecorino Romano is balanced with an equal amount of Parmesan to create a flavorful cream sauce that isn’t overwhelming. Of course, the ratio of Pecorino to Parmesan can be easily adjusted up or down to suit individual tastes.