Ingredients
- 6 tablespoons butter
- 2 slices rye bread
- 4 slices American cheese, torn into large pieces
- 4 slices Swiss cheese, torn into large pieces
- Kosher salt
- Freshly ground black pepper
- 1/2 pound freshly ground chuck, formed into two 4-ounce patties, roughly the size and shape of 1 slice bread
- 1 large onion, split in half, sliced thin from pole to pole (about 2 cups)
- 1/2 cup water
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