Patty Melt with Secret Sauce

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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

Make the Secret Sauce

  • In a small bowl, combine the mayonnaise, ketchup, mustard, pickle juice, paprika, and garlic powder.
  • Whisk until fully blended and set aside.

Cook the Onion and Beef

  • Heat the olive oil in a skillet over medium-low heat. Add the sliced onions. Cook for 30-40 minutes, stirring occasionally, until the onions are deeply golden brown and caramelized. If the onions start to stick, add a splash of water.
  • In a bowl, mix together the ground beef, salt, pepper, and Worcestershire sauce. Form into four thin, oval-shaped patties.
  • Cook the patties in the same skillet over medium heat until browned, about 2-3 minutes per side. Remove and set aside.

Assemble and Cook the Sandwiches

  • Spread one side of each bread slice with softened butter.
  • Layer the bottom bread slices buttered-side down with Swiss cheese, beef patty, caramelized onions, secret sauce, cheddar cheese, and top bread slice buttered-side up.
  • Cook in batches in the skillet over medium heat until both sides are golden brown and the cheese is fully melted, about 1-2 minutes per side.

Storage

  • Store leftover secret sauce covered in the fridge for up to 5 days.
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