Ingredients
- 1 1/2 lb. (750 g) ground beef (at least 15% fat)
- Kosher salt and freshly ground pepper
- 4 slices sharp white cheddar cheese
- 1 Tbs. unsalted butter
- 1 Tbs. avocado, canola or vegetable oil, plus more as needed
- 2 yellow onions, cut into 1/4-inch (6-mm) rounds
- 4 tsp. balsamic vinegar
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