Anchovy

Anchovies were a type of fish which were consumed on Earth.

To battle the effects of cyanide, the Tenth 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. (TV: The Unicorn and the Wasp)

While having dinner with her former companion Tom, Iris Wildthyme picked the anchovies off her pizza. (AUDIO: Wildthyme at Large)