In a large bowl, combine the ground meat, breadcrumbs, onion, garlic, eggs, Parmesan, chopped rosemary, milk, salt, and pepper. Mix everything thoroughly using your hands while wearing disposable gloves.
Once the mixture is ready, shape it into balls of about 35-40 grams (1 - 1½ oz), dust them lightly with flour, and stick a sprig of rosemary into each one.
Next, heat a deep frying pan or pot over medium-high heat, add some olive oil, and let it heat up before frying the meatballs.Fry until golden brown and cooked through, about 6–8 minutes. Once cooked, remove the meatballs from the pan using a slotted spoon and transfer them to a plate lined with paper towels to absorb excess oil.
Serve the meatballs hot, with pasta, rice, and/or homemade tomato sauce.