Classic Patty Melt (Print Version)

# Ingredients:

01 - 1 pound ground beef.
02 - 1 large onion, thinly sliced.
03 - 8 slices rye bread.
04 - 4 slices Swiss cheese.
05 - 4 slices cheddar cheese.
06 - Butter for grilling.
07 - Salt and pepper to taste.
08 - 1/2 cup mayonnaise.
09 - 2 tablespoons ketchup.
10 - 1 tablespoon sweet pickle relish.
11 - 1 teaspoon Worcestershire sauce.

# Instructions:

01 - Mix sauce ingredients in a bowl, set aside.
02 - Melt butter in skillet over medium heat. Cook sliced onions until caramelized (15-20 minutes). Remove onions and set aside.
03 - Form beef into 4 thin patties. Season patties with salt and pepper.
04 - Cook patties 3-4 minutes per side.
05 - Butter one side of each bread slice.
06 - Place 4 slices of bread butter-side down in the skillet. Layer: Swiss cheese, patty, onions, cheddar cheese. Top with remaining bread, butter-side up.
07 - Grill until golden and cheese has melted (2-3 minutes per side).
08 - Rest 1 minute before cutting. Serve with secret sauce.

# Notes:

01 - Can use turkey or chicken instead of beef.
02 - Don't rush the onions - slow cooking develops sweetness.
03 - Keep heat medium to avoid burning bread.