Berlin's specialty; Currywurst. It is like street food, very akin to the bacon wrapped hot dogs sold in San Francisco's Mission District. However most places are real establishments rather than hot dog carts... and they are all over the city. Some are more trust worthy than others.
First you get a bratwurst cooked in what is clearly very healthy grease;
It was rather good, and I felt full for pretty much most of the day. I'm sure there was more than a full meal's worth of calories involved.