Ingredients
- 2 tablespoons vegetable oil
- 2 large onions, thinly sliced
- ¼ small onion, finely chopped
- 1 pound ground beef chuck (20% fat)
- 1 tablespoon ketchup
- ½ teaspoon garlic powder
- 1 teaspoon kosher salt
- ¼ teaspoon freshly ground black pepper
- 1 tablespoon vegetable oil
- 8 slices seeded rye bread (preferably Levy’s)
- 4 ounces aged sharp cheddar, thinly sliced
- 4 ounces Swiss cheese (such as Emmenthal), thinly sliced
- 8 teaspoons mayonnaise
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