Make four beef patties by shaping each one into a larger-than-golfball size sphere. Place on platter while you heat the grill.

Put a cast iron skillet or griddle on the gas grill. Heat the grill to high, until the internal temp is over 500 degrees. Lid closed.

Open lid. Put patties on skillet. Smush them down with a larger black skillet until they are really thin and sizzling on the hot griddle.

Cook two minutes. Flip. Cook a few more minutes. These don't take long.

With a metal spatula, remove the patties to an oven proof platter. Put a mound of cheese on one, and put the other patty on top, like a sandwich. Put in 350 degrees oven for a few minutes to melt the cheese.

Serve on warm, soft bun with mayo and everything else!