The discussion where you can get the tastiest currywurst of Berlin, is one that is often carried out passionately. Two names always surface: Konnopke en Curry 36. Both eateries often have long queues.
The saucages, with or without guts, with or without buns, with or without french fries, are always served with a huge load of curry. Lovely! Detail: the last time I visited, a waitress had a tattoo of Curry 36 on her arm. Without the saucage, that is. (nowadays there is a second branch at Zoologischer Garten station)