For the best sausage (wurst) in Zurich visit Sternen Grill at the Bellevueplatz on Theatrestrasse 22. map
For a great traditional Swiss and non-touristy restaurant try Gambrinus Restaurant on Langstasse. Reservations required and by phone only (or in person, if you're nearby), no email reservations accepted. map
Try a Swiss specialty Kalbsgeschnetzeltes mit Rosti, a veal dish with a creamy sauce served with potato. May be available at Gambrinus (above).
For some of the best chocolates in Zurich try Confiserie Honold with stores in the Old Town and at six other locations around Zurich. Also try Confiserie Teuscher on Storchengasse 9, Bahnhofstrasse 46 and Schweizergasse 11 (also available at Cafe Felix at Bellevueplatz 5). map
Two restaurants recommended in DK Europe Guide:
Kronenhalle Restaurant Bar, Rämistrasse 4, 8001
Haus zum Rüden, Limmatquai 42, 8001
Considered one of the best desserts makers in Zurich - try Cafe Schober on Napfgasse 4. map