There are many great pasta sauces/ragu's that aren't bolognese.
My favourite vegetarian is this one:
Ingredients:
1 can of diced Tomatoes or 4-5 diced fresh ones.
1 carrot,
1 onion,
2 gloves of garlic,
200 grams of Feta,
2 tablespoons of sour cream
2 tablespoons of sugar
1 tablespoon of Italian herbs
100 grams of Tomato paste
salt and pepper, oil to fry.
Finely dice the onions and fry them in a bit of oil in a pan, crush the peeled garlic gloves and give them a quick fry too. Caramelize it with the sugar. Add the dices tomatoes, chop the carrot very finely and add it too. Now add the Sour Cream, the herbs and the tomato paste. If it's too thick, add a little bit of water. Now crumble the feta cheese and add that too. Now season it with salt and pepper and voila.