In a medium bowl combine ground beef, egg, 3 tablespoons parmesan cheese (15 grams), chopped parsley, salt and pepper, and form into 4 patties.
In a small dish add 5 tablespoons parmesan cheese (25 grams), and coat patties one at a time.
In a medium frying pan add 1 tablespoon olive oil heat and then add patties and cook until no long pink and browned.
On either an indoor pan grill or BBQ grill place tomato and onion slices, drizzle tomato slices with olive oil and sprinkle with salt, oregano and basil, do the same with the onions except no basil. Flip them over and repeat. Grill until cooked. (the onion slices will take longer than the tomatoes to cook). If you want place open hamburger buns on the grill to toast.
On every bun place a beef patty, a slice of tomato, onion, some lettuce and mayonnaise or even an extra slice of parmesan cheese if desired. Enjoy!