Kefir grains cannot replace quark or cottage cheese, but they can be used to make quark.
First, you place the Kefir grains in cow's or goat's milk to create Kefir.? Then you must DRAIN the kefir to remove most of the whey (about 65% by volume, I think - not sure).? You can do that by draining the kefir in CHEESECLOTH.? What remains in the cloth will be "kefir cheese", which will be about 10% protein.? That will be perfect in place of quark or cottage cheese (in my mind better...).
