Chocolate

Chocolate was a form of candy enjoyed by Humans.

Reference

 * Myfanwy liked dark chocolate. It was the only thing he would eat without barbecue sauce. (TW: Fragments)
 * The Doctor and Martha Jones traveled the universe in search of the perfect chocolate milkshake. (IDW: Agent Provocateur)
 * On Colony 34, outside the walls of third city, chocolate was one of the many items that was very hard to obtain. (BFA: Live 34)
 * The Doctor enjoyed a chocolate Easter egg, but then passed it to Lady Christina de Souza after becoming concerned that its sugar content might harm his teeth. (DW: Planet of the Dead)