Yum! Tried the shack stack, cheeseburger with a fried portabello mushroom "patty". So cheesy, nice texture changes & tasty! Mushroom flavor was strong. It had a little sticker on the paper that said "caution hot". They weren't lying. I burned my tongue on the fried portabello, so wait a few minutes & let it cool. Cheesy fries were ok. Cheese sauce from a can I'm guessing. Next time I would just get the plain fries. Burger is not huge, so price was a bit high. But again, we're in Vegas on the strip at New York New York. I'd get the burger again!