Preheat the oven to 375 degrees F.
In a large mixing bowl, combine the turkey, pork, bread crumbs, milk, garlic, eggs, rosemary, chile flakes and salt and pepper and mix with hands until just combined. Form into 5-ounce balls and place in a shallow casserole. Roast in the oven until dark golden brown. Set aside.
Reduce the oven temperature to 350 degrees F.
Meanwhile, in a large oven-proof skillet, heat the olive oil over high heat. Add the onions and garlic and cook over medium heat until well browned. Add the chili flakes and salt and pepper, to taste. Add the rosemary and red wine and stir until the wine is reduced by half. Add the tomatoes and simmer for 15 minutes. Add the meatballs, transferring to a large container if necessary, and cook in the oven 2 1/2 hours. Serve in shallow bowls with the sauce, topped with the parsley leaves.
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