Toast
Toast was Jenny Everywhere's favourite food, consistent across all of her incarnations. (COMIC: The Late Shift)
One account suggested that Jenny's love of toast — specifically, when it was “crunchy and warm, soft in the middle with butter and sweet from the whipped honey” — was a holdover from her original childhood before she was splintered across the Multiverse and became “the Shifter”. She was six when she ate her first piece of toast, having breakfast with her sister and her mother, and she would associate the taste of toast with the memory of her mother ever after. (PROSE: Memories of Nowhere)
The accommodations at Rio P’Brytje did not offer toast as part of the room service, to Jenny Everywhere's dismay. This struck her as a greater strike against the place than the fact that it was mostly made up of bridges hanging precariously over pools of lava. (PROSE: The Time of the Toymaker)
When celebrating Jenny Everywhere's return to the Multiverse after her temporary, mysterious disappearance, her friends celebrated by proposing a literal “toast”, whereby they raised slices of toast rather than glasses of alcohol. These slices of bread had been toasted using a Heat Ray invented by Laura Drake as a present for Jenny. (PROSE: The Disappearance of Jenny Everywhere)