For some reason the burger is kind of wavy-shaped instead of flat. It comes with raw onions on it, which are not my favorite, but at least they're mild ones.
In case this is not enough calories for you, the Beef Prosperity is offered in a set with fries and a Mango Float. This consists of Sprite (I think) with a whipped topping that was heavier than Cool Whip but lighter than soft-serve ice cream. It was creamy and didn't melt and I really don't know what it was. Both it and the burger were enjoyable in that so-bad-it's-good way that characterizes most fast food.