Dice the onion
Mince or finely chop the garlic
Grate the carrot
Dice the celery
Season the mince beef
Fry the pancetta in the oil in a big frying pan or wok at high heat until it really gets some dark colour
Reduce the heat a little, add the onion, garlic, carrot and celery and fry gently. Try not to colour the onion and veg
When the onion is translucent, add the mince.
Fry until the mince has browned.
Add tomato puree or tinned toms if desired (I normally use puree)
Add the wine
Reduce to a simmer and cook for at least an hour
Serve with the cooked spaghetti