I love spaghetti and red sauce, but don't love the jar tomato sauce. Here is what I add to it when I do not make my own.
Tomatoes, raw diced or canned
Buffalo or Beef, ground
Baisil leaves, chiffonade
Spinach leaves, chiffonade
Black or Red Beans
You can add any veggies you want. It's a nice way to hide them from picky eaters, including yourself!
This is great over brown rice pasta with a little cheese on top.