Here's the recipe I've used. It's by Anna del Conte-certainly an authority on Italian cuisine. Notice the addition of milk....it softens the flavours.
A long,slow cooked sauce like this is a 'ragu'. My mother always left hers to cook while we went to Mass.
Ingredients
60g/2oz butter
2tbsp extra virgin olive oil
60g/2oz unsmoked pancetta, finely chopped
1 small onion, finely chopped
1 carrot, finely chopped
1 celery stalk, finely chopped
1 garlic clove, finely chopped
1 bay leaf
400g/14oz lean chuck or braising beef, coarsely minced
2tbsp concentrated tomato paste
150ml/5fl oz red wine, such as a Sangiovese or a Barbera
2 pinches of grated nutmeg
Salt and freshly ground pepper
150ml/5fl oz meat stock
150ml/5fl oz full fat milk
Method
Heat the butter and oil in a heavy-based saucepan and cook the pancetta for 5 minutes, stirring frequently. Add the onion, and when it has begun to soften, add the carrot, celery, garlic and
bay leaf. Cook for a further 10 minutes, stirring frequently.
Put in the minced beef and cook until it is medium brown in colour and nearly crisp, crumbling it in the pot with a fork. Do this over a high heat so that the meat browns rather than stews, but be careful not to let the mince become too brown and hard.
Add the tomato paste and continue to cook over a high heat fr a further 2 minutes. Still over a high heat, add the wine, nutmeg, salt and pepper and the stock.
Bring to the boil, then turn the heat down to very low, so that the mixture will reduce very slowly.
Set the lid askew over the pan and cook for about 2 hours, adding a couple of tablespoons of milk from time to time.By the end of this time all the milk should have been added and absorbed, and the ragù should be rich and thick, like a thick soup.
Taste and adjust the seasoning. The ragù is now ready to dress a dish of homemade tagliatelle, thus producing one of the greatest dishes of Emilia.