Banana

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

The Doctor claimed that while partying with Madame de Pompadour in 18th century France, he had invented the banana daiquiri several centuries early. He also gave Rose the advice, "always bring a banana to a party". (DW: The Girl in the Fireplace)

At the begining of the episode The Doctor says he wishes people would invent a silver ball that is edible. At the end of the episode Rose gives him a muffin with silver balls and the doctor announces that it's a choc-banana muffin (Fear her)

According to the Doctor, a banana grove grew in Villengard at the former site of the weapons factories. (DW: The Doctor Dances)

On Space Station Chimera, the Doctor found a banana whist searching his pockets for piece of wire. He gave the banana to Peri who later started to eat it (but gave up when the sight of a dead Androgum made her feel sick). (DW: The Two Doctors)

Reverend Ernest Matthews ate a banana just before he was turned into an ape by Josiah Samuel Smith. (DW: Ghost Light)

During a visit to Blackwood Falls, The Doctor ate two banana splits in quick succession. (NSA: Forever Autumn)

Duncan Goode told Martha, "...don't judge a banana by its skin". (NSA: Wishing Well)

The Doctor describes a "Banana Surprise" (NSA: Martha in the Mirror)

Expecting to land on a sunny beach, the Doctor emerged from the TARDIS with an inflatable banana. (NSA: Snowglobe 7)