It's Grated Romano cheese.
Romano Cheese via kwout
Romano is a hard cheese of Italian origin prepared predominantly with cow's milk or sheep's milk or goat's milk or mixtures of two or all of these.
There are several types of Romano cheese. Determined by the type of milk used, name of Romano cheeses may be preceded by the word Vaccino (cow’s milk), Pecorino (sheep’s milk) or Caprino (goat’s milk).
The most famous example of Romano cheese is Pecorino Romano, an exclusive Italian cheese with DOP designation from the Italian government.
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Check out 12 tips for cooking with cheese shared by Serious Eats.