Max und Moritz
Unless you completely flunked geography/social studies, you should know that being in Berlin means you're also in Germany. As such, there's really no reason not to head to this Kreutzberg spot for a taste of Old German cuisine. Max und Moritz survived both World Wars and has been serving traditional German fare like schnitzel, eisbein (pork knuckle), lamb stew, and Westphalian sausages for ever. On top of that, they've got their own house lager, which should help to wash everything down.