Anchovy

Anchovies were a type of edible fish from Earth.

To battle the effects of cyanide, the Doctor needed, among other things, something salty. Rejecting salt as too salty, the Doctor wolfed down a jar of anchovies given to him by Agatha Christie. (DW: The Unicorn and the Wasp)

Iris Wildthyme picked the anchovies off a pizza she was having for dinner. (BFNW: ''Wildthyme at Large)