While on holiday in Italy I also visited Bologna. Of course it is then mandatory to eat tagliatelle alla Bolognese. I've eaten it a few times and noticed that there was a lot of difference in taste; despite the recipe being fixed. Everyone makes their own version of it. And now I have one for the books, so delicious.
It differs slightly from the original but is so good that the purists will probably forgive me.
Normally I say that you should make your own variant, but with this recipe the advice is to follow it exactly. You will not regret it!
I assume everyone knows by now that you eat this with tagliatelle, especially not with spaghetti. The sauce comes into its own with tagliatelle, it is better absorbed.