It's not a buffet, it's "preplated". That means that you never need to leave your table. They serve (very good) salad and bread, then they bring you a plate with your meal on it. You can ask for more of anything (and ignore anything you don't want). A fixed dessert is included. I don't know if you could order a different one at extra cost, but I suspect not. It's unlikely you would have room!