Delvan fluff pastry was a type of dessert food.
In 2371, Julian Bashir had two Delvan fluff pastries for breakfast. Odo observed him doing so and remarked that as a doctor, Bashir should know better which foods not to eat for breakfast. (DS9 episode: "Facets")
Delvan fluff pastry was one of the items served during the celebration aboard the USS da Vinci of Domenica Corsi's promotion to commander in the year 2377. (CoE eBook: Remembrance of Things Past, Book I)