Eating out in Berlin
One of the main tourist areas for eating out is Hackescher Markt / Oranienburger Strasse.
For cheap and good food (especially from Turkey and the Middle East) you should try Kreuzberg and Neukölln with their abundance of Indian, pizza and Döner Kebap restaurants. Prices start from 1,50 € for a Kebap or Turkish pizza (different from the original Italian recipe and ingredients).
If you are looking for a quick meal you could try getting off at Görlitzer Bahnhof or Schlesisches Tor on the U1 line - the area is filled with inexpensive, quality restaurants.
Kastanienallee is a good choice too. It's a popular area with artists, students and has a certain Bohemian charm.
Try Imbiss W, at the corner of Zionskirchstr and Kastanienallee, where they serve superb Indian-fusion food, mostly vegetarian, at the hands of artist-chef Gordon W.
Further up the street is the Prater Garten, Berlin's oldest beer garden and an excellent place in the summer.