For the Ketchup and Mustard Sauce:
1 cup sour cream
1/3 cup ketchup
¼ cup yellow mustard
½ cup pickle relish
For Burgers and to Serve:
1 ½ pounds ground beef, 80%
1 tablespoon Worcestershire sauce
Salt and white pepper or fine black
1 teaspoon each granulated garlic and onion
Non-aerosol neutral cooking spray
8 slices yellow American cheese
Lettuce, sliced tomato and sliced or finely chopped onion, to serve
Sesame burger rolls
For the ketchup and mustard sauce, combine all ingredients in small bowl.
For the burgers, combine the beef, Worcestershire, salt, white pepper and granulated garlic and onion. Score meat and roll 8 balls, then pat the balls into very wide and thin patties.
Heat large cast-iron or nonstick skillet over medium-high heat, spray surface and cook 4 patties 2 minutes on first side, 1 minute on next. Remove patties and repeat. Top the second batch pf patties with a slice of cheese each and slide off heat. Top with the reserved patties and another slice of cheese and cover with foil or lid to melt cheese.
Stack lettuce, tomato and onions on roll bottom, top with double patties and sauce and set tops in place.