quark 2, from Old Church Slavonic tvarog, curds, cottage cheese.

So quark as a particle in physics from a character's name in Finnegans Wake, but also a grand dairy product in Germany. Thicker than yoghurt, thinner than cream cheese. Makes a goodly schmier on a bagel, or can be eaten plain with maybe a little bit jam mixed in. "Three huffs for Mr Quark." (Oh, and then there's the barkeeper on Deep Space 9, one of the Star Trek franchises.