This tiny restaurant is located under the bridge on Mühlenstraße, down the street from the Warchauer subway (U-Bahn). From the outside it doesn't look like much, however thankfully to all the TripAdvisor posts, I decided to drag my girlfriend here to try their schnitzel. For 5.00 Euro you get a huge Schnitzel, fries and a salad. You can see from the attached pictures that you get it on a paper plate, but don't let that fool you, it's GREAT!
MY TIP: Get off at the Berlin Ostbahnhof and walk south to Mühlenstraße, turn left and follow the East Side Gallery (artistic Berlin wall) until you get to the bridge. Hidden on the cross corner you'll find this great restaurant. Weather permitting, take your lunch "to go", then head back to grassy area behind the wall. Here you can enjoy your lunch away from the traffic and in peace while getting a moment to soak in the sun and relax by the lazy river!