Hot chocolate (or hot cocoa) was a beverage made with chocolate, and served heated.

Ensign Sonya Gomez accidentally spilled hot chocolate on Captain Jean-Luc Picard near the beginning of her tour on the USS Enterprise-D. (TNG episode: "Q Who?") Following this incident, Gomez was given the nickname "Ensign Hot Chocolate" (later shortened to "HC") by her crewmates. (SCE eBook: Many Splendors)