Aside from using canned tomatoes, she makes tomato sauce quite well...the ingredients and preparation are good and correct. I mean, I use canned tomatoes when I don't have fresh pomodoro, but they should really be used as a last resort and not the basis of your ragu or other pomodoro. It takes several hours to properly make sauce from scratch but it's worth it. Just make a whole shitload of it, bottle it, and save it. That way you can add whatever ingredients you want and then your fresh tomato sauce that you add to it is already there.
Every summer we usually make tons and tons of the stuff because her dad has a really big garden and we get them fresh, so we have a stockpile of it for all winter.