Banana

Bananas are a fruit beloved of the Doctor (DW: The Doctor Dances, DW: The Girl in the Fireplace) and also a good source of potassium. (DW: The Doctor Dances)

The Doctor claimed that while partying with the Madame du Pompadore, he had invented the banana daquiri several centuries early (DW: The Girl in the Fireplace).

Thanks to the Doctor's intervention, a banana grove now grows on the former site of the weapons factories of Villengard. (DW: The Doctor Dances)