Fish finger

The Doctor enjoys fish fingers and custard.

Fish fingers were a type of human food. They were made from fish cut into rectangles, covered in breadcrumbs, then heated up. Not long after regenerating, the Eleventh Doctor found some frozen fish fingers in Amelia Pond's kitchen, along with some custard, and decided to eat them together as fish custard. (DW: The Eleventh Hour)

Later, the Doctor compared House's penchant for eating TARDISes with that of enjoying processed food like fish fingers. The Doctor's TARDIS, temporarily in human form, expressed puzzlement about what fish fingers were ("Do fish have fingers?"). (DW: The Doctor's Wife)