Patty Melt with Secret Sauce

Ingredients

For the Secret Sauce
1/4 cup mayonnaise
2 tablespoons ketchup
1 tablespoon Dijon mustard
1 teaspoon pickle juice
1/4 teaspoon paprika
1/4 teaspoon garlic powder
For the Patty Melts
2 tablespoons olive oil
2 large onions thinly sliced
12 ounces 85/15 lean ground beef
1/2 teaspoon salt
1/2 teaspoon black pepper
1 teaspoon Worcestershire sauce
8 slices rye bread
3 tablespoons unsalted butter softened
4 Swiss cheese slices
4 cheddar cheese slices

Instructions

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