What is the bread of Cerberus?

The "bread of Cerberus" is not a real thing. There is no mention of such a thing in Greek mythology or any other source. It's possible you may be thinking of something else, or perhaps it's a fictional element from a specific story or game that you're thinking of.

If you could provide more context, such as:

* Where did you encounter this term? (A book, movie, game, etc.)

* What is the context? (What was being discussed?)

I might be able to help you figure out what you're looking for!