Ingredients:
Approximately forty-five minutes

Output: four sandwiches

One tablespoon of olive oil is required.
2 cups of finely sliced onion from 1 big onion
Six tablespoons of unsalted butter, divided Garlic powder and kosher salt
ketchup, 2 tablespoons
1 and a half pounds of lean ground beef
2:1 Worcestershire sauce
8 rye bread slices
Onion powder, 1/2 teaspoon
Roughly eight ounces of Swiss cheese, sliced

Instructions:

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