The wineworm was a type of animal lifeform that originated in the Delta Quadrant, known to be used for food preparation by chefs of the Komar civilization. Knowledge of this use was part of the culinary repertoire of the Talaxian traveler Neelix.
The wineworm's blood was used by the Komar in making the dough for komar cookies. The other ingredients in the dough included Turian stardust, rattle fern caviar and Betelgeuse butter. Neelix noted that, although the Komar used wineworm blood in preparing the dough, he would omit the ingredient, as he felt that this strong flavoring distracted from what was already an "intense taste". (ST reference: Star Trek Cookbook)