Adequate. That was the first word that came to mind when I visited Petra Cafe. The hummos is good, the falafil sandwich is Chicago-big and dependable. It's quiet there, and you can usually find a place to sit. This is exactly what you expect, and that is certainly a huge part of its appeal. If you're a vegetarian looking for lunch in the Loop, you could certainly do worse. Petra Cafe, 331 S. Franklin, (312) 913-9660.