1. Preheat a frying pan over medium heat. 2. Lightly toast both halves of the hamburger bun, face down. Set aside. 3. Separate the beef into two even portions, and form each half into a thin patty slightly larger than the bun. 4. Lightly salt each patty and cook for 2 to 3 minutes on the first side. 5. Flip the patties over and place two slices of cheese on top of each one. Cook for 2 to 3 minutes. 6. Build the burger in the following staching order from the bottom up: bottom bun dressing tomato lettuce beef patty with cheese onion slice beef patty with cheese top bun Makes 1 hamburger.