Mince take half beef, half-pork.
Brisket – ideally, the pancetta, if not, porchetta. Well, or just brisket.
Mozzarella is one big ball.
If there is no buttermilk, you can use low-fat cream. Beat the egg lightly, RUB the Parmesan finely, and chop the pancetta finely. And mix everything for the meat.