The Earth confection for which Counsellor Deanna Troi has a lifelong passion, the subject of several light-hearted scenes aboard the Enterprise-D.
Chocolate is Troi's favourite food and her habitual comfort. She insists on the real thing, and regards the replicator's attempts to substitute something healthier as an impertinence.
In the Next Generation episode The Price, she asks the computer for a real chocolate sundae and is treated to a lecture on nutrition before it complies. In The Game she explains to Riker, in some detail, the proper way to approach a chocolate sundae, as an experience to be savoured stage by stage.
In Liaisons, the Iyaaran ambassador assigned to her wishes to study pleasure and happily joins her in sampling dessert after dessert. The trait stays with the character in her later appearances.