Hot chocolate

From Memory Alpha, the free Star Trek reference.

Hot chocolate is an Earth drink typically made by mixing cocoa powder in boiling hot milk. Deanna Troi was a fan of hot chocolate, no doubt an extension of her love of chocolate. (TNG: "Violations")

In 2365 Ensign Sonya Gomez ordered hot hot chocolate from a replicator in main engineering and later spilled it on Captain Picard. (TNG: "Q Who")

In 2370, on the day after the fourth anniversary of Jennifer's death at Wolf 359, Benjamin Sisko suggested to Jake that he get a hot chocolate and talk to him about his mother. (DS9: "Second Sight")