Smashing Patty with Confidential Sauce

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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