Anyone who is interested in dutch food in Switzerland should visit this store online or in Adliswil (10 km from downtown Zürich):

http://www.hollaendische-laedeli.com

They sell the following products:

Hagelslag, pindakaas / peanut butter, drop, stroopwafels, bruine basterdsuiker / brown sugar, satésaus, cheese, beer and even frozen products like bitterballen, kroketten, frikandellen and bamischijven and much more ......

The staff is really friendly and they are open from Wednesday until Saturday.
The webshop is open 24/7!