Lawman800 has the answer. Make it halal/kosher and we have a winner. Add to that, for those rare occasions that the villain has an actual allergy, food loaf without the allergen. I genuinely think that is the answer. And when they riot, let them duke it out among themselves. Too bad that can't be done. Joe Arpio's plan hast to have been tested in court though.
Malo periculosam libertatem quam quietum servitium. - I prefer liberty with danger to peace with slavery.