Celery is a plant that is native to Earth. It is most often chopped up and used in stews and salads.
T'Pol had a salad with celery, which she ate, cut up, with a knife and a fork. (ENT: "The Andorian Incident")
Naomi Wildman planned to use carrots and celery to build a tetragon, an assignment given to her by Seven of Nine. (VOY: "Memorial")