Convenient Cake is just that; cake which conveniently adopts the consumer's favourite taste and texture. Like everything else at the PPC, this is possible only due to the excess of plotholes in HQ. It is similar to a Canon Cookie.
It is suspected that any attempt to consume Convenient Cake outside of a sufficiently warped Word World would result in either an extremely dull, gritty taste, or death. Experimentation is not recommended.
Convenient Cigarettes are also available.