The Bergblick restaurant which is next to the valley station of the Nebelhorn gondola and just across the creek from the rink is probably worth a look since it is so very close to the rink. It was excellent in 2007 on my first trip to Oberstdorf, then pretty bad under new operators in 2013, and good again during my last visit in 2017. I'm sorry I don't have more recent information.