Berlin is at a crossroads, and it is a cosmopolitan city. The local food is more interesting and has more influences than you might realize. Berlin has always had newcomers, refugees, displaced people and immigrants arriving, just like Paris or Rome, so it’s overly simplistic to ask for recommendations for a Berlin specific food that has been eaten for centuries.
In terms of a regional specialty, I think of Königsberger Klopse, which originate further east, which are meatballs in a caper sauce, Eisbein which is Berlin style smoked pork hock/knuckle, and Buletten aka Boulette aka Frikadellen (big, flattened meat ball) .
Currywurst is spelled with a C because curry is a borrowed word.
Nante Eck offers Eisbein, Currywurst and Buletten, if you’re looking for old- fashioned regional dishes. I haven’t been, just pointing out one restaurant that offers all 3.
https://www.nh-hotels.com/en/travel-guides/berlin/food-in-berlin
@linguafood has covered the everything comprehensively, if you are looking for typical German Berlin foods, as well as the non German foods Berlin does well.
