Beef can be used in place of lamb if desired.
Flour acts as a binder, but it is possible to make the recipe without using flour.
In place of kneading meat mixture in Step 2, you can pass mixture through a grinder until finely ground. The finished product should be similar to processed meat, so that it can be thinly sliced and then pan fried without crumbling.
You can also top with mozzarella cheese if you like.