Split the buns in half and spray the interior surfaces lightly with the cooking spray. Place the buns, cut side down, on the grill. Allow the buns to char slightly, and then transfer them to a platter.
Holding the grill pan away from the stove, spray the surface with the cooking spray. Season the burger patties with salt and pepper to taste. Place the burger patties on the grill, and cook for about 2 1/2 minutes per side for rare. During the last minute, put 1 slice of cheese on each burger.
In small bowl, mix together the mayonnaise, sweet relish, and ketchup. Set aside. To assemble the burgers, place the burgers on top of the bottom buns. Pile lettuce, tomato, red onion, and Russian dressing on top of each burger, and set the bun tops in place. Serve.
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