Steak should be cut in thin slices. Pound steak out until it is about 1 cm thick. Combine flour, salt, pepper and garlic salt and rub into steak on both sides. Allow to stand for 5 minutes, then cut into 8-10 serving pieces. Heat butter in a large, heavy frying pan and brown steak on both sides over moderate heat. Sprinkle with chopped onion and add bullion. Bring to a boil, cover pan, and simmer for 1 hour or until steak is tender. Sprinkle cheese and parsley over top, cover again, and cook another minute or so to melt cheese. Good served with hot fluffy rice.