Wiktionary
gremolata
n. A paste of capers, parsley, lemon zest, olives and olive oil served as an accompaniment to meat or fish
Wikipedia
Gremolata
Gremolata or gremolada ( or ) is a chopped herb condiment classically made of lemon zest, garlic and parsley. It is a traditional accompaniment to the Milanese braised veal shank dish ossobuco alla milanese.