Extra Celery

Extra celery is not a type of food, but rather a term used in the US to refer to an extra side dish served alongside a main course. It's essentially a smaller portion of a side dish that's additional to the regular side dish served with a meal.

For example, if you order a burger, the restaurant might serve a side of fries as the regular side dish. However, if you want an extra side dish, you can ask for an "extra celery" which would be a smaller portion of fries, salad, or some other side dish.

So, in summary, extra celery is not a specific type of food, but rather a term used to describe an additional side dish served in restaurants in the US.

Does that help? Let me know if you have any other questions!