Hi Kari,
I think quark has 12grams protein per 100grams.
We get it in 300gram packages here... it's rather like yogurt, maybe a bit thicker and more cheesy in taste. I don't really like it that much if I eat it alone though.
We call it Kesam here in Norway and I didn't know what to call it while writing in English.
I had to search on wikipedia, so I might have gotten the name wrong