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Preheat griddle or grill to medium-high.
Place 1/4 of the ground beef on a piece of wax paper. Place another piece of wax paper over the top and press it down with a heavy pot until it's super thin. Add a tablespoon of onion onto the patty and press again with the pot to smash the onion into the patty. Season the patty with salt and plenty of black pepper. Repeat with remaining meat—you should have 4 patties altogether.