Fork
Thin, crispy-edged patties with caramelized onions and melty American cheese on a soft potato bun. This is not a gourmet burger and that is exactly the point. It is pure nostalgic perfection.
Divide beef into 4 equal balls. Do not season yet.
Heat a cast iron skillet or flat griddle to screaming hot over high heat.
Place a beef ball on the skillet and immediately smash flat with a sturdy spatula. Season with salt and pepper.
Cook without moving for about 2 minutes until the edges are deeply browned and crispy. Flip, add cheese, and cook 1 more minute.
Toast the buns cut-side down in the rendered beef fat for 30 seconds.
Assemble burgers with mustard, lettuce, tomato, pickles, and ketchup. Serve immediately.