Divide the ground beef into 6 even balls (approximately ⅓ lb each). Then form the balls into patties that are approximately 4 inches wide and 1 inch thick.  Place the patties in the refrigerator (covered in plastic wrap) while you preheat the grill.

Preheat the Grill over medium high heat (approximately 450-500 degrees F). Rub oil on the grill grates to prevent the patties from sticking to the grill.

Prepare the bacon and other toppings while the grill preheats.

Place the patties on the grill over direct heat.  Cook for 4-8 minutes (flipping the patties halfway through the cook time) depending on how you like your burger cooked (see notes).  Use an instant-read meat thermometer to make sure that the burgers are cooked to your preference.

Place the buns on the grill and cook for 1 minute until they are browned slightly.  Watch them closely so that they do not burn.

Add a lettuce leaf and onions to the bottom bun of each bun.

Remove the beef from the grill and add them to each  of the hamburger buns on top of the lettuce.

Then top each patty with the tomatoes, 2 slices of the prepared bacon and avocado slices.  Serve warm and enjoy!