- For vegetable stock, heat oil in a deep non stick pan. Dice onion and add to the pan. Slice carrot and add and saute on high heat.. Chop celery, quarter 4-5 mushrooms and add and stir.. Add salt and mix.. Add plenty of water and boil for hour.. Strain and use when required.. Boil 3 cups vegetable stock in another deep non stick pan. Chop cabbage.. Add 4-5 quartered mushrooms, sliced carrots and corn to the stock.. Then add cabbage, chopped capsicum and cook for 2-3 minutes.. Finally add broccoli, salt, pepper powder and let it boil for 2-3 minutes.. Pour into soup bowls and serve hot..