In which areas did the street food Currywurst originate in the early 1950s?

Answer

Berlin and the Rhine-Ruhr area

Currywurst, which consists of sliced sausage smothered in a curry powder and spicy ketchup sauce, originated in the early 1950s in the areas of Berlin and the Rhine-Ruhr.

In which areas did the street food Currywurst originate in the early 1950s?
foodGermanycuisinedish