Custard

Custard was a yellow dairy product which was consumed on Earth.

Shortly after his regeneration, a hungry Doctor couldn't find any food palatable except custard with fish fingers dipped into it, a dish he called "fish custard." (DW: The Eleventh Hour)

Whilst on the 'Crooked World' the Eighth Doctor deliberately imagined (and therefore created) a custard pie gun. (EDA: The Crooked World)

When repositioning his ship close to the Gateway, Rorvik ordered that "I want a landing that wouldn't ripple the skin off a custard.". (DW: Warriors' Gate)]])

In 'The Impossible Astronaut' when companion Amy Pond asks a younger version of the Eleventh Doctor to trust her, he asks her to swear to him on something that matters. After some thought, she smiles and says "Fish fingers and custard". (DW: The Impossible Astronaut)