Soak the bread in water for 5 minutes, squeeze by hand to wring excess water, and add to turkey. Add the prosciutto, sausage, eggs, Parmigiano, 1/4 cup pecorino, 1/2 cup parsley, nutmeg and 4 tablespoons of olive oil and mix lightly. Season with salt and pepper and form the mixture into 3-inch balls. Place the balls on a sheet tray, cover with parchment and chill for 1 hour in the refrigerator. Preheat the oven to 375 degrees F.
In a large, heavy-bottomed skillet, heat the remaining 4 tablespoons of oil to almost smoking and brown the meatballs in the oil on all sides. Add the tomato sauce and the wine and bake for 30 minutes. Serve with the remaining pecorino and parsley.
In a 3-quart saucepan, heat the olive oil over medium heat. Add the onion and garlic and cook until soft and light golden brown, about 8 to 10 minutes. Add the thyme and carrot and cook 5 minutes more, until the carrot is quite soft. Add the tomatoes and juice and bring to a boil, stirring often. Lower the heat and simmer for 30 minutes until as thick as hot cereal. Season with salt and serve. This sauce holds 1 week in the refrigerator or up to 6 months in the freezer. Yield: 4 cups