I found one way to use the cauldron.some may call it exploity XD
You beeline for octopus, and create an assylum, then you pump 3-4 lunatics and station them around your mokka's city (forest, hill, or forested hill across a river if avaliable) and wait for one of them to turn into a barbarian.
Your city should be garrisoned with captured wolves or lions which you keep moving in order not to heal. You also need a couple of sun mages nearby.
Once the unit turns into a barbarian start throwing wolves at him, and blind it with the sun mage. You'll end up with more golems than you want, you can then use any variety of captured fauna to pump them up to str 8 (that's what elephants are for).
If you don't like to go for octopus overlords, it can also work with mutation or werewolves, but it would take a bit more time.
Enjoy, and happy grafting.
Edit: The barbarian unit may be tempted to move away from the city, if that happens offer it a tiny morsel (weak wolf, worker...), and then blind it.