Oh this is going to be fun! I have my most muscular slave squeezing all of his considerable muscle bulk into a tiny confined metal cage with just his head free for me to torment as I wish. I know this slave is a confirmed carnivore and spurns the taste of broccoli and other vegetarian options so this is my chance to feed him everything he does not really want to eat. With even his head trapped under a glass jar, I can whip him until he complies with all of my dietary demands.