Hard to describe, but I remember it as a very thinly shaved dried or cured meat. Probably akin to the meat in chipped beef, sans the gravy.
We talked with a Swiss girl that was on her way back from a year in the US, and she suggested it as "Swiss" food, and sure enough, you could order a plate of it. Can't remember what it came with, though, such as mustard, horseradish, etc.