Located on Olaf Ryes Plass sits Ryes, a cousin of the Nighthawk Diner (another afar.com highlight). Like the Nighthawk, Ryes also serves American diner food and shakes, and poses as a nightclub after hours.
The breakfast burger is apparently the thing to eat after a night out (it's served with both fries and chips), and nighttime punters often return in the late morning just for this burger.
Authentic interior design, era-appropriate music, the customers and staff all look like they've come out of a production of Grease. A swell place to go, indeed.