Nice restaurants in Frankfurt, Germany that are open for breakfast???

[FaithManor]

Our flight is a red eye so unfortunately our nearly 8 hr. layover in Frankfurt begins at 6:15 a.m.... so we won't be able to see much considering that we would potentially need to be back to the airport by 11:30 a.m. since our flight leaves at 1:30 p.m.

 

Figuring an hour for deplaning and immigration, sometime between 7:30 a.m. and 9 a.m. we'd like to have a very nice breakfast and do some walking to stretch our legs.

 

Does anyone know of a good restaurant for this that isn't far from the airport? We could take a taxi if necessary if the airport is far enough outside the city that walking would not be optimal. We could walk around the area once we get to the restaurant.

 

Any suggestions?

I don't know about what would be open when, but Frankfurt has a fantastic local transit system.  As I recall, it is about 10 minutes by train from the airport (where there is a train station) to the main train station downtown, or other major train stops where you'll have all kinds of food options.