Let the cheese sit out for about 2 hours to get soft enough to spread easily.
Preheat a grill or griddle to VERY HOT to get the right char.
Season the meat with salt and pepper. Mix and form 6 balls, then flatten each to a patty.
Grill the burgers for about 3 minutes each side. Do not press down on the patties while cooking or all the juices will squirt out and dry out the patties! Toast the buns on the grill. Spread the cheese on top of the patties; then place the top half of the bun on top to adhere with the cheese. Remove from the grill.
Garnish the bottom half of the bun with mayo, ketchup, pickle, red onion, tomato, and lettuce.