They have a small menu of some German dishes - so far we tried the currywurst and the bratwurst with sauerkraut and potato salad and both were very good.
More importantly they also have German bread rolls (very rarely seen in the US) and just across the street is Dittmers an outstanding old-school German butcher - they have many different house-made cold cuts (like blood-tongue sausage), sausages, kassler etc.
Another interesting German place is Hahdough in Hayes Valley with great German pastries, cakes etc -they even had Franzbroetchen - an unique pastry mainly found around Hamburg which you normally even have problems to find in other parts of Germany.