This delicious stock has a depth of flavor that comes from roasting the vegetables. Use whatever vegetables you have on hand, but avoid anything too strongly flavored, such as broccoli or cabbage, as they will overwhelm the stock.
All the work has really been done for you, since you begin with a store bought dressing, and just fancy it up. A bit of oregano, a smidgen of dried basil and minced onion. A teaspoon of sugar and you 're done.