Cocoa

Cocoa, also known as hot chocolate, was a beverage made from chocolate.

In 1454 Mexico, the First Doctor drank cocoa with Cameca, which in Aztec culture meant that the two of them were engaged to be married. (TV: The Aztecs) "I made some cocoa and got engaged."

- First Doctor

In the 1970s, Mike Yates planned to use the Bunsen burner in the Third Doctor's lab to heat some cocoa. (TV: Terror of the Autons)

Evelyn Smythe loved cocoa so much that she insisted upon bringing her own supply of cocoa mix on her initial trip in the TARDIS. She shared some with William Leaf and George Crow, but Crow didn't like it, preferring ale. (AUDIO: The Marian Conspiracy)

The Tenth Doctor and Rose Tyler had hot chocolate during their visit to Paris. (COMIC: A Date to Remember)