Classic Patty Melt With Rye, Beef, & Cheese

Ingredients

• 6 slices rye bread
• 6 tablespoons unsalted butter, softened
• 1 kilogram ground beef
• 3/4 teaspoon ground black pepper
• 1/2 teaspoon sea salt
• 1/4 teaspoon onion powder
• 3 tablespoons mayonnaise
• 2 tablespoons ketchup
• 1 tablespoon bacon bits
• 1 teaspoon sweet relish
• 1 teaspoon white sugar
• 6 slices cheddar cheese
• 6 slices Provolone cheese