Thalian chocolate mousse was a confectionery from Thalos VII.
The cocoa beans used for the mousse were aged for four hundred years. Thalian chocolate mousse was one of Wesley Crusher's favorites. In 2365, he replicated a bowl of the mousse for Salia, who was being transported to Daled IV, and she also found the dessert a wonderful treat. (TNG: "The Dauphin")