Hey, @marblely. Thank you for all the kind words. I try to do within the limits of the food of course to accommodate all the tastes I can. It doesn't always work out, though.
I'm afraid I don't know what the stone is made out of. It is fairly heavy, but not so much that it can't be maneuvered.
It is always fun to experiment :) And just skip whichever part that doesn't work the next time :D