Using ⅓ lb of beef, form balls in your hands. Smash them into patties that are about the same size as your buns. Use your thumb to dimple the center of the burger patty. Place the burgers in the fridge until ready to use them. Once ready to use, sprinkle the top side of the burgers generously with Jeff's Texas style rub recipe. Preheat smoker to 225 using indirect heat. Place burgers on smoker grate and smoke for about 1 hour or until they reach 150°F in the center. While the burgers are smoking, prepare all of the vegetables, grill the onions if desired and grill the buns. Set up a very hot gas or charcoal grill and when the burgers reach 150°F, sear both sides for about 1 minute. Just before the burgers are done, lay a piece of cheese over the meat so it can melt. Build the burgers or let each person make their own.