The idea of units tasting the stew for random effects and objectives moving is super creative, although I am not sure about the witch. Is that kind of a meta-game where she is interacting with the player only? Regarding 'growth,' it's quite subtle. While units might 'grow' in power with those stew buffs or even regenerate, the theme just isn't prominent enough for me. But, I think it would be fun for a seasonal/themed event.