Rattle fern caviar was a type of food delicacy originating in the Delta Quadrant. This variety of caviar was part of the culinary repertoire of the Talaxian traveler Neelix.

Rattle fern caviar was used by Neelix in making the dough for komar cookies. The other ingredients in the dough included Turian stardust and Betelgeuse butter. Neelix noted that the chefs of the Komar civilization also used wineworm blood in preparing the dough, but he felt that this strong flavoring distracted from what was already an "intense taste". (ST reference: Star Trek Cookbook)