Gryphon's Aeire
Since I make 200 or so meatballs at a time and then freeze them, it seems as though they keep getting larger and larger so to make them all the same size, I mix them in a 9x13 or other flat pan, spread them out evenly and cut into squares, then roll out each square. If you mix and cut them on a rimmed cookie sheet you can also bake them on it.