In a large saucepan over medium-high heat, bring vegetable broth to a boil.
To the boiling broth add potatoes, carrots, peas, corn, turnip, cabbage, mushrooms and salt. Boil for 40 minutes, or until vegetables are very well cooked. Drain.
Puree vegetables in a food processor or blender. Sprinkle the puree with brown sugar and stir gently. Store tightly covered in refrigerator.
