How about “carry-out”??
Anything he wants! :^)
A diet of cereals makes sense, since gladiators were slaves, and slaves were generally fed cereals. I'd never given it any thought, either. :^) "Caesar! Who made the salad?" "Me, and Seven Seas!"
There were food stalls, which were kind of like today’s “carry-out”. There are remains of these, with food still embedded in the lava,in Pompeii.