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 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")