Chocolate

Chocolate was a food made from cocoa, enjoyed by humans. Because it was naturally bitter, it was often sweetened with sugar.

Chocolate was one of the many types of jelly baby owned by the Doctor. (GAME: City of the Daleks)

Behind the scenes
The Twelfth Doctor's letter in DWA15 12 mentions Juevos VI, a moon made of chocolate. According to the Doctor there wasn't much to do on Juevos VI because eating the chocolate was illegal.

Doctor Who chocolates

 * Coincident with season 8, Nestlé issued the Nestlé's Doctor Who milk chocolate. It came in 15 collectable wrappers, each of which had a tiny instalment of a story called Doctor Who Fights Masterplan "Q", starring the third Doctor, Jo Grant and
 * Doctor Who-themed have been issued on several occasions; a recent version was the Bon Bon Buddies 2010 Doctor Who Milk Chocolate Countdown Calendar based upon series 5 Daleks.