Tube grubs were a larva-like organism eaten live as a delicacy by the Ferengi.
Contrary to Human foods, tube grubs were preferred cold, before they became warm. Ishka offered to make tube grubs for Quark and even pre-chew them, when he visited her in 2373, but Quark stated he'd never liked her grubs. (DS9: "Ferengi Love Songs")
Joseph Sisko considered offering Cajun-style tube grubs at his restaurant, Sisko's, in New Orleans in 2372, though he said he would have to cook them, a suggestion which Nog found odd. (DS9: "Homefront")