What are some German dishes that could be served in a fast food style restaurant?

I'm working on a project where I am supposed to create a fast-food restaurant that serves German style food. I know things like Bratwurst and Currywurst would work but I need some more suggestions please
 
Potato salad, as long as you know it's is served warm and so would need to be kept under a warmer (or however you choose to keep it). Sauerkraut is another thing for you to serve.
 
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