In a large kadhai, heat olive oil and saute ginger garlic paste for a while.
Then, slightly saute spring onions and add sweet corn, carrots, and french beans.
Meanwhile, in a mixer, add water and sweet corn and blend the mixture to form a smooth paste.
Cook these ingredients for a minute, and then add water and sweet corn paste.
Add salt, stir well, cover the vessel, and boil the soup for 10-15 minutes or until the vegetables are well cooked.
Mix corn flour with water to ensure no lumps in the corn flour slurry.
Add the corn flour slurry to the soup and mix well. Boil until the soup thickens.
Finally, add black pepper powder, vinegar, and spring onion, and serve warm.