Carrot

Carrots were a common vegetable found on Earth.

They were rich in vitamin A, and could be liquified into carrot juice, a substance favoured by Melanie Bush but disdained by the Sixth Doctor. (DW: Terror of the Vervoids)

Peri Brown once found herself in a dimension modelled upon a combination of the Alice in Wonderland book she had been reading and the salad she had been eating. Among the creatures she met in this world was a talking carrot. (DWM: Salad Daze)

Soon after his regeneration, the Eleventh Doctor found himself craving food and had young Amelia Pond produce different types of foods, most of which he rejected after tasting. He so despised carrots that he rejected them out of hand, without even tasting them. (DW: The Eleventh Hour)

Andy Stone in 2059 was the first of the Bowie Base One colonists to become infected by a mysterious life form, most likely through consuming a carrot washed with the base's contaminated Martian water supply. (DW: The Waters of Mars)