In a large mixing bowl, combine the ground beef, black pepper, sea salt, onion powder, mayonnaise, ketchup, bacon bits, sweet relish, and white sugar if desired. Mix until well combined.

Shape the beef mixture into evenly sized patties that fit the rye bread, about 3/4 inch thick. Set aside.

Heat a skillet over medium-high heat. Cook the patties for 4-5 minutes per side, until a deep brown crust forms.

Butter one side of each slice of rye bread. After cooking the patties, toast the buttered slices in the skillet until golden brown, about 2-3 minutes.

Assemble the sandwich by placing a patty on the unbuttered side of one slice, adding cheddar and provolone, and topping with another slice butter-side up.

Grill the assembled sandwiches in the skillet over medium heat for 3-4 minutes per side until golden brown and crispy, and the cheese is melted.

Carefully slice the sandwiches in half and serve hot with crispy fries or a fresh salad.