There are Döner (excellent Turkish fast-food) stands all over the city, plenty of them around the Rotebühlplatz. Take care to order "mit scharf" (dried chili, hot) or "ohne scharf" (not hot). For learners of German it's worth noting that both "mit scharf" and "ohne scharf" are incorrect German and would literally translate to either "with spicy" or "without spicy". Instead simply "scharf" (spicy) or "nicht scharf" (not spicy) should be used, but may then not be understood at the food stands.