Guten Tag, Frankfurt

Just arrived in Frankfurt for our European user conference.  The flight was packaed, but I actually managed to get 4 hours of sleep.  I have booth duty tonight, so I will try to make it in to town after that. Hopefully they don’t roll-up the streets at 6 PM, but since it’s Sunday, I may be out of luck.  Anyone know any good, authentic German restaurants near the Frankfurt Airport (only requirement that they not be in a hotel!).