Use your hands to combine the beef, grated onion, Worcestershire, coconut aminos, and Montreal steak seasoning in a large bowl.
Shape the meat into 4 patties. Preheat a large cast-iron skillet over medium-high to high heat. Once hot, add the patties and turn the heat down slightly to medium to medium-high. Cook the burgers for 4 minutes on each side, flipping once.
Once the burgers are cooked, place 1 slice of cheese on each burger. Turn off the heat, drape a piece of foil on top of the burgers, and let the cheese melt.
Split the buns in half and top each with mayo, ketchup, mustard, 1 lettuce leaf, 1 tomato slice, and 1 white onion slice. Add a burger to each, and serve.
Video
Notes
Don’t press down hard on the burgers as they cook because this will squeeze out their juices!
The nutrition label below is for 1 cheeseburger on a bun with all the fixings.
Nutrition Information per Burger for Burger Mix Only (Meat, Onion, Worcestershire, Coconut Aminos, and Montreal Steak Seasoning):