In a large mixing bowl, add the beef, Dad's All Purpose rub, ketchup, soy sauce, worcestershire sauce, breadcrumbs and an egg. Mix the ingredients together by hand and start forming the patties.
Place the patties in the fridge for 20-30 minutes to firm up.
Preheat the grill to 350 degrees and set for indirect heat. Place a cast iron on the grates and let it warm up.
Add in half a stick of butter, mushrooms and chopped onion. Sauté until all the water cooks out and add 1 tbsp of flour. Cook for another 2-3 minutes to allow the raw flour taste to cook out.
Add in bone or beef broth, ketchup soy sauce to the skillet.
Place a wire rack over the skillet and place the firmed up beef patties on top. Cook until the internal temp of the patties reaches 150 degrees.
Place the salisbury steaks into the gravy and let it cook for another 5 minutes allowing the meat to soak up in the flavorful liquid.
Remove the skillet from the grill, allow it to rest for 5 minutes, serve and enjoy!
Notes
Use an 80/20 ground beef chuck roast. The additional fat adds flavor and keeps the meat tender once it renders down during the cooking process.
By smoking the salisbury steak over the broth, the liquid includes the beef drippings and the patty absorbs more of the smokiness.