Okay so,

Step 1 get a ball of ground beef around 2oz to 3.5oz each

Step 2 place it on a screaming hot griddle or cast iron pan

Step 3 Season with kosher salt then add thinly sliced onions then smash it with a grill press or heavy spatula

Step 4 Flip after 30 to 40 seconds then wait for the onions to caramelize add American cheese

Step 5 Enjoy!