Quark cheese (Speisequark)

So, after a quick search. What is this strange and not so rare item. This quark of the non-physics kind. I am trying to make a cheesecake and this has been suggested as an ingredient. I am full of doubt because a) German cheese cake tastes like it was baked with a sock inside B ) Sour cream this is not.

Search yeemonkey

I did, of course, the word quark does appear once in that thread.

Found this: http://www.youtube.com/watch?v=TZ9RMpEM9KQ

http://en.wikipedia.org/wiki/Quark_%28cheese%29

Thanks bal, clear and perfect danger.