1. In a food processor, pulse the roughly chopped carrots, celery and pancetta for about 10 seconds. Set aside.
In a large Dutch oven, add vegetable oil and butter over medium heat.
When butter is melted, add finely chopped onions and cook until translucent.
Add pulsed carrot, celery and pancetta mixture to onions and stir to combine. Add a pinch of salt and pepper and sauce the soffritto (vegetable mixture) for about 10 minutes.
Next, add the ground chuck, pork and veal to the soffritto. Combine the meat with the vegetables, add a large pinch of salt and freshly ground pepper to the mixture.
Cook the meat (breaking it up with a wooden spoon) until the meat has lost its pink color (about 10-15 minutes).
Add the milk to the meat and let it simmer gently until the milk evaporates (10-15 minutes over medium heat).
Add the small grating of nutmeg.
When all the milk has evaporated, add the white wine and cook until all the wine evaporates (about 15 minutes).
Add the hand-crushed tomatoes to the pot, stir to combine, and turn the heat down to a low simmer.
Add 1 cup of water and a small sprig of basil. Stir to combine.
Partially cover the Dutch oven and let the sauce simmer for 4 hours (or longer). Periodically check on the sauce and give it a stir. If it looks too dry, add a little bit of water from time to time.
Serve over cooked tagliatelle, fettuccine or papardelle pasta, add a grating of fresh Parmigiano Reggiano and serve.