Ingredients
- 2 onions (about 1 pound/450g)
- 2-3 tablespoons unsalted butter
- salt and freshly ground black pepper
- 12 – 14 ounces (350g) ground beef
- 4 slices Swiss-style cheese, such as Emmenthal
- 4 slices Jewish rye bread
- Additional softened butter for the bread and frying the sandwiches
Personal Notes
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