1: Toast the burger buns with the clarified butter or ghee.
2: Preheat a large stainless steel sauté pan or skillet over high heat for 2 minutes.
3: Place balls of beef in pan and smash down with a stiff metal spatula or smasher as hard as you can to flatten the patties as much as possible.
4: Season generously with salt and allow to cook until patties are well browned and tops are beginning to turn pale pink/gray in spots, about 45 seconds.
5: Using a bench scraper or the back side of a stiff metal spatula, carefully scrape patties from pan, making sure to get all of the browned bits.
6: Flip patties and immediately place a slice of cheese over each patty, then stack the second directly on top.
7: Immediately remove from pan and transfer to waiting bottom burger bun.
8: Dress the burger with pickles, then ketchup and mustard, then the onions and finish with top burger bun.
9: Serve.
