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Classic Patty Melt With Secret Sauce

A classic patty melt made with seasoned lean beef patties, gooey cheddar and Swiss, caramelized Vidalia onions, all grilled between slices of marble rye and slathered with tangy secret sauce.
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Ingredients
  

Beef Patties

  • 680  g lean ground beef
  • 2  tsp Worcestershire sauce
  • 1  tsp salt
  • ½  tsp black pepper

Sandwich Assembly

  • 12 slices marble rye bread
  • 3 slices cheddar cheese
  • 3 slices Swiss cheese
  • 8  tbsp unsalted butter
  • 3 Vidalia onions thinly sliced
  • ½  cup secret sauce

Secret Sauce

  • 60  ml mayonnaise
  • 60  ml Dijon mustard
  • 1  tbsp barbecue sauce
  • ½  tsp hot sauce

Instructions
 

  • Mix mayo, Dijon mustard, BBQ sauce, and hot sauce until smooth. Set aside.
  • Combine ground beef, Worcestershire, salt, and pepper. Gently mix and shape into 6 oval patties.
  • Melt 4 tbsp butter in a skillet over medium heat. Cook onions for 10–12 minutes until golden and soft. Set aside.
  • Wipe skillet, then cook patties over medium-high heat, 2 minutes per side, until browned and juicy. Remove and wipe skillet again.
  • Butter bread slices. In the skillet, layer buttered bread (butter-side down) with secret sauce, onions, cheese, patty, more cheese, onions, sauce, and top with another buttered slice.
  • Cook over medium heat until bread is golden and cheese melts, about 3–4 minutes per side. Press gently and repeat with remaining sandwiches.