Zum Grünen Baum is a traditional Franconian Gasthaus in the old town, the kind of place that has been feeding locals for generations without much thought for trends. The menu is solidly regional: roast pork knuckle, Schäufele (shoulder of pork braised until tender), fried carp from Franconian fish ponds, and Franconian bread dumplings served in broth. The portions are substantial and the prices are reasonable by German standards.
The room has low ceilings, dark wood, and a mix of regulars and tourists who have found it through word of mouth. In summer, the courtyard garden is open for lunch and dinner. It is not glamorous, but it is the sort of restaurant that gives you a genuine taste of how people in this part of Bavaria actually eat.