1 lb ground beef, 80/20 (the fat is the whole point)
4 slices american cheese (short-melt, not mozzarella)
2 brioche or potato buns
butter, for the buns
salt & black pepper — season the outside only
smash sauce: mayo + ketchup + chopped pickles
thin onion, tomato, a little lettuce
The Way
Roll the cold 80/20 beef into loose golf-ball rounds. Don't pack them, and don't salt yet — salt now just pulls the juice out before its time.
Get a cast-iron pan screaming hot, just short of smoking, with a thin film of oil.
Drop a ball and within the first 15 seconds press it flat and thin — one firm press, once. This is the whole secret; past 30 seconds the juices set and that lacy crust never comes.
Leave it about 90 seconds until the edges go dark and lacy. Now salt and pepper the top.
Scrape under the crust and flip — keep the crust intact — and lay the american cheese on straight away. Thirty to sixty seconds and it droops and drapes over the edge.
Butter the cut buns and toast them face-down in the same pan until golden.
Build it: bun, smash sauce, lettuce, tomato, the cheese-draped patty, onion, lid. Press once — the cross-section bite is the whole reward.
midnight tip — one press, then leave it. press it again and you squeeze out everything that made it juicy.