I ordered their original beef burger with cheese and upgraded my fries to a poutine. If you like Harvey's burger, then this is the next level up of a char-grilled burger. The burger bun is nothing special, but the patties are nicely seasoned and lots of toppings to choose from. Their poutine was really good, the gravy was perfectly salted, and good amount of cheese curds on top of some nicely done skinny fries!
I saw a lot of people ordering their steak cut onion rings, and they looked amazing. It's probably something I'll order and try next time I visit Big Jack's Burger.