T.K.
Jamie Oliver makes an 8 veggies sauce. He roasts all sorts of veggies. Tomatoes, bell peppers, onions, zuchini, and a bunch of other stuff. Then he purees all that with an immersion blender. It makes a thick super nutricious red sauce. He says he makes it in huge batches and freezes flat in gallon ziploc freezer bags so he will have sauce for months after just cooking once. I'm sure you can google it.
For a quick easy version, infuse some olive oil with herbs and spices and use that to sweat tomatoes, zuchini, onions, peppers, and mushrooms and toss my pasta in that. The veggies will give off thier water to make a sauce if you cook them low and slow.