In a medium bowl, use your hand or a rubber spatula to combine beef, ricotta, Parmesan, parsley, egg, nutmeg, salt and pepper. Form mixture into 8 meatballs, transferring them to a plate as you go.

MEANWHILE, MAKE THE MEATBALLS In a bowl, soak the bread in the milk until the milk is absorbed, about 5 minutes. In a large bowl, combine the beef, ricotta, Parmigiano, egg, lemon zest ...