Peel the onions and cut them into very thin slices. In a bowl, mix them together with sumac and parsley. Cut the tomatoes to small cubes. Cut the beef against the grain into small slices or cubes.
In a frying pan stir-fry the beef on hot oil or fat. Add the salt and continue cooking on low heat for about 20 minutes, until the beef releases the water and the liquid evaporates and gets absorbed by the beef. Add more water if needed and cook until the beef gets softer and more tender.
When the water is gone, add two more tablespoons of oil or fat, add the spices, fry for a minute, then add a cup of water and cook slowly on low heat until you get the desired amount of the sauce.
Cover the beef gravy in the pan with lavash bread or tortilla wrap for a minute to heat it up. When heated, place the wrap on a plate and top it with tomatoes, onion mixture, two or three tablespoons of beef and sprinkle with a little bit more of parsley.Make sure you close at least one side of the wrap to prevent the sauce from leaking.
Serve warm with additional salad and/or pickles. Enjoy :)