Chop up a small onion, lots of garlic, a green bell pepper, one zucchini, and a small head of broccoli and saute till the vegetables are cooked but not mushy. Tender-crisp is lovely. Add some tomato sauce (I use tomato paste and water, because it's just tomatoes and cheaper than canned tomato paste) so there's enough sauce for your pasta. Add some salt and cayenne and serve hot over pasta.
I like it this way, but other members of the family insist it needs sausage. Usually we don't have sausage.