This excellent and nutritious sauce combines beautifully with any type of pasta. Rotini or rotelle are good because their ridges hold the sauce as you eat. We think that spaghetti sauce is one of the easiest recipes to make vegetarian. You don't need meat in this type of sauce. The vegetables add more than enough flavor. You can use your favorite vegetables in this sauce; don't limit yourself to just a few. Add some sliced or chopped zucchini or yellow summer squash. Grated carrots would be delicious. And more types of mushrooms, including dried mushrooms, add umami, that "Fifth flavor" That tastes like meat.