I can highly recommend a Korean restaurant.
Shilla
Badenerstrasse 503+505
8045 Zürich
Moderate prices and tasty food.
I enjoyed it a lot. And the little dishes as Kimchee and other fermented delicacies were just perfect.
Classic bbq at the table.
Ebikon LU, Restaurant Falken am Rotsee.
Northern and Western Chinese. We pre-ordered the Beijing duck. I think you need to make sure you get the Chinese menu...
They make a very nice keuy teow here. Fresh every day and perfect for a rainy monday lunch time. I dont know about the other menu items, seems to be standard run of the mill, apart from they also do Dat teow moo in the afternoon (Sun dried pork refried).
Tiny "Mom & Pop" restaurant between Oerlikon and Seebach (next to Seebach train station) - it also double-up's as a supermarket.
Bahnhaldenstrasse 2, 8052 Zürich
Food is very authentic, but slightly more pricy than what you would expect in this kind of setup (but worth the money imho)
Outside Zurich proper, but for Peking duck, Zen in Adliswil has a really good one despite being pricey, and they also do dim sum on weekends.
The dim sum is ok, as we haven't found anything decent in all of Switzerland. Would be great if anyone had any recommendations for that.
http://suan-long.ch/scentofbamboo/
It may not be very authentic Asian but serves quite well internationalized asian cuisine which suits most. I have always been to Altstetten.