Start making the tomato meat sauce placing the extra-virgin olive oil and butter in a saucepan, and turning the heat to medium.
When the butter starts foaming, add the diced onion, carrot, celery, and garlic
Sauté and stir until the onion is soft and translucent.
Add the ground meat.
Stir with a wooden spoon, and break the meat into small bits. Cook until the meat is fully browned.
Add the wine, salt, and pepper. Turn the heat to high, and let the wine evaporate.
Add the tomato . . . . nutmeg... and milk.
When the tomato meat sauce starts boiling, turn the heat to low. Cover the saucepan and simmer slowly for about 1 hour, stirring occasionally.