1. In a large mixing bowl, combine the ground beef, ground pork, breadcrumbs, finely chopped onion, minced garlic, milk, egg, salt, and pepper.
2. Mix the ingredients together until well combined.
3. Shape the mixture into meatballs, typically about 1 to 1.5 inches in diameter.
4. Dredge each meatball in flour, shaking off any excess.