Love me some currywurst...
Currywurst, currywurst everywhere. The Berliners really love their sausages with ketchup. I don't blame them, they're pretty good with a side of fries and a cold beer. Konnopke's Imbiss has been around since 1930, and the first (or one of the earliest) purveyors of this sausage-ketchup deliciousness. Gauging from their Wikipedia page, which is only in German BTW... the scarcity of meat and ketchup in East Berlin after the wall was built led to the popularity of currywurst. The location of Konnopke's Imbiss is directly underneath the train tracks near Mauer Park and very easy to get to. Totally worth a visit!
Konnopke's Imbiss
Schönhauser Allee 44B, 10435 Berlin, Germany