I had never heard about it either, until this FOAF showed me. i was over at his apartment with my friend, and we were watching a movie. I noticed every once in a while he would go to the oven to check something, but I never caught on til he came back with a big smile on his face. He said, "It's done, we'll just let it cool." I didn't even know what the fuck he was talking about... I didn't even know this guy, let alone he did K. But I did a fat track of his shit anyway, and it tasted like vanilla pudding powder mix. When I got back from nothingness, I asked him wtf was in it. he said 2 drops vanilla. I've been doing it ever since. I haven't experimented with other flavors yet, but I will next time I evap...I'll post results. Someone try this and post here to back me up. it really does taste better than just the crystals!
PS- I just use plain vanilla flavoring (liquid) that comes in a brown bottle. I use 2 drops...haven't experimented with more. Drop in the vanilla and use a spoon to homogenize the mixture in your pyrex dish, then evaporate away!