The eggplant (Solanum melongena) was a plant from Earth with an edible fruit.
In 2151, eggplant was served aboard the Enterprise. Phlox remarked to Hoshi Sato in the Denobulan language that he didn't care for that vegetable. Sato attempted to reply in Denobulan that eggplant was not a vegetable but a fruit, but accidentally used the word for "nostril" instead of "fruit". (ENT: "Dear Doctor")
In 2372, Joseph Sisko bragged to his son about the size of the eggplant he was getting from his garden, which he described "as big as Crenshaw melons and twice as heavy." (DS9: "Homefront")