In a large pot, heat oil. Once it’s hot, add minced ginger, garlic, and green chili and saute for a few seconds.
Then add the white spring onions, carrot, green beans, sweet corn, sweet corn paste, and salt. Saute the veggies for 2-3 minutes on medium flame.
Add vegetable broth (or water) and give a quick stir. Ensure nothing is stuck at the bottom of the pot. Allow the mixture to boil until all the veggies are cooked, approximately 10-12 minutes over medium-low heat.
Now prepare a cornflour slurry by mixing 1 tablespoon of cornflour in ¼ cup of water. Mix well and then add to the soup.
Simmer the soup for another 2-3 minutes until the soup thickens, and then add the white vinegar, crushed black pepper, sugar, and mix well to combine. If desired, you can also add soy sauce and red or green chili sauce.
Garnish the sweet corn soup with spring onion greens and serve hot!