Jo, "Jaegerschnitzel mit pommes frites, bitte" is all he needs to be well fed... Oh, "und ein kalt pilsner, auch. Danke".
He'll survive.
Or he could try for a currywurst and a Dortmunder Union (strong beer) but he might need your headache and painkiller help with that choice.

If he's really adventurous he could get Schweinebraten - pork in a thick gravy with veg, or for a snack in the street some Kartoffelpuffer - potato and egg pancakes with a topping of choice. Everywhere has them.
Forget MacD and KFC, go to a schnellimbiss.