Preheat your Z Grills pellet smoker to the smoke setting.
Season your London broil with your favorite steak seasoning or S-P-G mixture.
Sautee garlic until it is lightly browned, then add ketchup, Worcestershire sauce, granulated garlic, and vinegar. Follow this up with salt and pepper, as well as a couple of dabs of your favorite hot sauce. Carefully whisk the combination until it is thick, then remove to cool.
Smoke the meat at your lowest setting until an internal temperature of 100F to 105F is reached at the thickest part of the meat.
Remove the London broil to rest and carefully remove the heat baffle of your Z Grill to expose the fire pot, then replace the grate.
Turn your Z Grills to the highest setting.
Sear until the desired internal temperature is reached. For the best flavor, we recommend 125F to 130F for medium rare.
Allow the meat to rest for 5 to 10 minutes before slicing, and enjoy!