Sternen Grill is a Zürich institution, known for serving the best bratwurst in town, with their signature hot mustard and "Bürli" rolls. They have a few other sausages like the Swiss "cervelat" and spicy links, as well as delicious roasted chicken. Our kids also like their German-style potato salad as a side.
This sausage stand is next to the Bellevue tram, with mostly takeaway business. But they have outdoor tables in the alley and an indoor dining area upstairs. We usually get our sausages to go and eat them by the lake.