Somewhere in my time in the US, I realised that tomato sauce is REALLY easy to make - it just takes time. I usually make a huge batch that lasts for about four meals of two people each. It freezes very well, and lasts in the fridge up to a week (I've never been able to resist it longer.)
The basis is tomatoes and onions, with a ton of garlic. After that, toss in whatever you want. Obviously, the more veggies you put in, the more texture it will have; but that's not a bad thing, especially for vegetarian pasta. For pizza I recommend slicing things thinly or sticking to leaves and minced peppers, because that way it doesn't mound up on the pizza, ans leaves you free to add other toppings.
