Ingredients
- 1½ lb. ground beef
- Kosher salt and freshly ground black pepper
- 5 Tbsp. canola oil
- 2 yellow onions, halved and thinly sliced
- 12 slices rye bread
- 12 thin slices cheddar, swiss, or American cheese
- 8 Tbsp. unsalted butter, room temperature
Personal Notes
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