Icoberry

From Memory Alpha, the free Star Trek reference

The icoberry is a dark blue or black fruit that is often used as an ingredient in various snacks and beverages.

The icoberry torte is a pastry made from icoberries. (DS9: "The Homecoming", "Sanctuary") Pureed or pressed icoberries are used in making icoberry juice. (DS9: "Let He Who Is Without Sin...")