Could be that's just what they call baklava in Arknights, in a smaller more portable form. More pets for Kay-chan.
It's a reference to Cerberus, which Ceobe is based on. Ancient Greek burial traditions included putting honey cakes in the coffins of the deceased because Cerberus was supposed to like them, similar to how they'd put coins in there for paying Charon's fare to cross the Styx.