Begin by lathering your burger patties with a little canola oil, then seasoning them thoroughly with your favorite BBQ seasoning (I am using Tennessee Smoke). Next, grab your trompo skewer. If you do not have one, then the base of a pineapple with a skewer coming out of it will work also. Start by stacking one burger patty with a slice of cheese on top followed by another patty with a slice of cheese on top. Repeat this until all the burger patties and cheese slices are on the trompo, then top the trompo with one half of your white onion. Set the trompo into the fridge for 15 minutes to set.
Preheat a medium heat fire (around 300-325F) for a two zone indirect cooking.
Pull the meat out of the fridge and place it on the cool side of the grill to cook for about 2 hours until the meat is 160F-165F. Every 30 minutes, make sure to rotate the trompo so the high heat will hit all angles of the burger. Once the meat is done, pull it off and let rest for 5 minutes.
Slice the meat off the trompo and begin building your taco with lettuce, onions, tomatoes, mayo, mustard and ketchup. Serve & enjoy!