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:
Olive oil should be heated in a big pan over medium-low heat. Twenty to twenty-five minutes after adding the sliced onions, caramelize them by cooking them, turning regularly, until they are very brown. Add little salt and pepper to taste.
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