After this convincing argument by my significant other:
"It's not particularly good, but it's not that bad either. And you can only get it in Zürich, so you should try it."...I decided to sample the Züri-Schnürre. It's like a hot veal spam sandwich. I don't know if it was "Mmmh..." (as advertised in the sign below) but it was tasty in a "I'm really hungry and I don't want a doner" kinda way. If you live in Zürich, you should definitely try it and maybe buy the accompanying T-Shirt. Pepito Snack is at Niederdorfstrasse 10, Zürich. Apparently, "pepito" their signature sweet mayo-like sauce that is applied to a variety of sandwiches. The sauce is tasty but they use a heavy hand so I'd recommend asking for less.