Are you a childless adult? Are you not charged with athe care of any invalid friends or relatives? Do you live in New York, or some other place where its possible to get decent groceries? Then listen, you have no excuse to ever buy jarred pasta sauce.
It is not so much a recipe that is offered here (at the link above) but a slightly scolding rejoinder for people who say they do not have time to cook. I am not one of those people, so I admit that I took some small offense from it all. But the advice given is excellent and the result was both inexpensive and delicious. In truth, it is so simple and easy that it is kind of stupid that someone has to tell people this. (But someone did.)
I added broccoli and red pepper to my version, which I zapped with an immersion blender — before serving on multigrain noodles — just because I wanted to get on with things.
Alternatively, and this is even dumber, though even less expensive and just as delicious, consider using only the best of what you can find in the produce aisle, and heating this through with your fried-up onions and garlic. Add a little feta and serve without tomato sauce as a kind of warm pasta salad.