Hmm I don't really know which food would be good, since Berlin doesn't have a lot of their "own food" since here are a lot of immigrants and lots of different cultures are mixed in here.
So you will find a lot of different dishes around the globe here~
But if I were to say the standard food most tourist would try to eat, then it would be the "Currywurst", it's sausages with tomato sauce and curyy...quite simple fast food~
If you would like to eat really good and authentic german food then it would be at the restaurant near the trainstation "Tiergarten".
It's fine, I just improvise with the story on spot, it's the first time I've done this and I don't even know how it'll turn out so can't say much about it xD