I have been twice and called the Hoop de doo Review in advance to let them know. They usually give you a choice of two or three entrees to choose from (usually a pasta w/ marinara sauce, grilled or steamed veggies w/ baked potato, and I think a fish dish for pescatarians). Last time I got the grilled veggies - they were so delicious! They were so plentiful and well-seasoned, it was actually one of the best meals that I had the whole trip!
While I'm sure they could make something for you without advance notice, I would strongly suggest calling ahead.