Ingredients:
Approximately forty-five minutes
Output: four sandwiches
One tablespoon of olive oil
2 cups of finely sliced onion from 1 big onion
Six tablespoons of unsalted butter, divided
Garlic powder and kosher salt
2 tablespoons of ketchup
1 and a half pounds of lean ground beef
2 teaspoons Worcestershire sauce
8 rye bread slices
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