Ingredients
- 1 1/2 pounds ground beef
- Kosher salt and freshly ground pepper
- 1 tablespoon vegetable oil, plus more as needed
- 2 onions, very thinly sliced (preferably on a mandoline)
- 8 slices American cheese
- 4 hamburger buns
- Ketchup, mustard and/or pickle slices, for topping
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