Unfortunately, they don’t serve meat substitutes, so you’re basically ordering a grilled cheese sandwich.
First, they have a veggieburger option (sans beef patty), which is basically a grilled cheese sandwich with tomatoes, lettuce and choices of cheese and/or onions.
And there’s also the option to have it “animal style” (it’s a “secret” menu offering) with grilled onions, pickles and more spread.
Burger without patty
Animal style grilled cheese