Boil prawn for 10 minutes in a saucepan (with 10 cups of water). Add salt and Soya sauce.
Remove prawn from saucepan with slotted spoon.
Spread oil in a fry pan and fry prawn for 5 minutes. Add water in which prawn were boiled. Add all vegetable and ginger paste in it. Boil for 10 minutes.
Add water if needed.
Your vegetable soup is ready now. You may add tomato sauce to make it more yummy.