In a large bowl, add bison, panko, egg, mustard, salt and pepper. Mix (don’t overdo it) and evenly divide into 4 portions.
Form 4 patties and place them on a plate. Cover with plastic wrap and transfer to the fridge for at least 2 hours and up to 8.
When ready to cook, remove patties from the fridge and allow them to get to room temperature, about 30 minutes.
Meanwhile, make the Bourbon Onion Jam recipe.
Preheat grill to 450ºF and oil grates.
Place patties, close the lid and grill for 5 to 6 minutes per side or until internal temperature reaches 135ºF to 140ºF.
About 3 minutes before they’re done, place hamburger buns, close the lid and grill them for 2 minutes.
Top patties with a slice of cheese, close the lid and cook until the cheese is melted and the buns are nicely toasted.
To assemble...Place lettuce on the bottom bun followed by the patty and then the Bourbon Onion Jam on top before placing a tomato slice. Serve immediately…