I haven't done that yet! I usually get the Royal with onion straws :)

It's funny, when I asked the waitress to add something to the burger, she assumed I was going to ask for onion straws and started writing it down. I just saw the horseradish mushrooms on their specials display and figured only good things could happen with that combo :)

Now I feel predictable. I will have to shake things up next time....;)