Start by cleaning the veggies
Chop them up and put them in a food processor to chop them even more finely. Don't process them too much however. Put them in a big pot (I'd recommend 4L at least)
Put the diced pancetta in the food processor and mince it
Add the pancetta to the pot and turn on the heat
Add some olive oil and stir constantly. Add some water if too dry.
Cook for 10-15min
Add the minced beef and sausage, removing the skin and crumbling it as much as you can with your hands.
Stir constantly to break down the bigger crumbles
Help yourself with two spoons to break down all the bigger pieces to achieve a fine mince
Keep cooking until all the meat juices dry off, about 20min
Pour in the red wine
Stir and keep cooking
Cook until the wine evaporates
Add all the passata, add also the nutmeg. Bring up to boil again and then lower the heat to keep boiling gently. Cover with a lid and keep boiling for 3-4hours, stirring every 15min more or less
That is the sauce, trust me, it will be really hard not to scoop it up and eat it over a slice of bread. Add salt and pepper to taste.
You can eat it right away, scoop it into plastic containers and freeze it, or into glass jars and seal it with the lid.
The latter requires the jar to be very clean and dry, fill it up to the top with the hot sauce, close it tightly with the lid and let cool down upside down. The sauce cooling will air seal the jar.