Options
You can easily add 1 yellow onion thickly sliced and 1 head of garlic finely chopped.
You can add cracked black pepper and other spices, such as Rosemary, Sage, Marjoram
You can blend in 1 cup of Pesto to liberally coat the vegetables after they are cooked.
You can also add various squashes, fennel, parsnips, turnips and rutabagas.