Once the grill is hot, brush the grate clean. Using tongs and a paper towel doused in oil, oil the grate.
Once the burgers are on the grill, season the tops with a bit more salt and pepper to taste.
Grill the burgers about 4 minutes per side (flipping only once for the best crust). Once flipped, season the other side with salt and pepper to taste.
Note: Do not press the burgers with the flipper during cooking. This presses out the precious juices from within the burger.
During the last 2 minutes of cooking, place the slices of cheese on top of the burgers, if desired.
Once the burgers are just cooked, through, transfer them to a plate and place a small knob of butter on the center of each burger for extra flavor and moisture (if there is cheese on the burger, skip this step). Let rest for a couple of minutes before serving. This will help the meat to relax and be even juicier.
Note: You can toast the buns, if desired, while the meat is resting.