Preheat your grill for medium-high cooking. Note that you’ll need it to be at least 300 F for use with The SmokeStack.
Sautee the mushroom and onion mixture over low heat until the onions are clear, stirring often. Turn off the burner but leave the mixture on it with a lid to keep it warm.
Fill The SmokeStack tin and place it on the heat source of your grill. Close the grill’s lid, wait 4-8 minutes, and then add the patties to the grill.
Grill the beef patties for 4-5 minutes. Flip them, then add the cheese to each one. Close the lid and grill for another 4-5 minutes.
Move the patties to the cool part of the grill, then grill the buns for 30-60 seconds, lid closed.
Assemble the completed burgers, adding lettuce and tomato if you like. Note: If I hear you’ve put steak sauce on these things, I will hunt you down. Just kidding. Maybe.