Ingredients:
– 1 tablespoon of olive oil
– 2 cups of finely sliced onion (from 1 big onion)
– 6 tablespoons of unsalted butter, divided
– Garlic powder and kosher salt
– 2 tablespoons of ketchup
– 1 and a half pounds of lean ground beef
– 2 tablespoons of Worcestershire sauce
– 8 slices of rye bread
– 1/2 teaspoon of onion powder
– Roughly eight ounces of Swiss cheese, sliced
Instructions:
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