Time Out says
A sausage from Sternen Grill is a Zurich must-do.
Sternen Grill at Bellevue is well-known as possibly the best place in town for this Swiss-German cheap eat. If you like sausages that is. And bread. The classic is a St Galler bratwurst or Cervelat sausage, which comes accompanied with a crusty bread roll, ketchup and/or mustard. At street level it's all "take-away" (although there's a plenty of tables where you can perch briefly to devour your meal). Those on a more leisurely schedule may prefer to head up to the first floor where a sit-down restaurant serves pretty much the same menu, with a few more salads and sides on offer. If you're into foodie souvenirs, you can purchase branded goods including Sternen Senf (mustard) and Sternen Bier (beer) here too.