Ingredients
- 1 large sweet onion sliced thin
- 2 Tablespoons olive oil + 2 Tablespoons butter
- 1-1/2 lbs ground beef
- 1 teaspoon Worcestershire sauce
- 3/4 teaspoon salt
- 1/2 teaspoon cracked black pepper
- 6 small slices rye bread, blended into crumbs
- 1 egg
- 4 oz swiss cheese, shredded
- 4 oz cheddar cheese, shredded
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