To make the Hamburger Royale, make the beef into patties as described in the hamburger recipe and fry. Slice the hamburger buns open and toast the cut sides.
Place the bottoms and cover with onion rings. Place the meat loaves on top and top with pickles. Then place a slice of cheese on top of each, place on a baking sheet lined with parchment paper and bake until slightly melted.
Meanwhile, mix all ingredients for the hamburger sauce. Remove baked bottoms and spread a tablespoon of hamburger sauce on each.
Place iceberg lettuce and tomato slice on top and cover with top. Press down gently.