Take the corn cob and pressure cook it for 3 whistles. Then collect the corn kernels and set aside. 

Then grind the cooked corn kernels (reserve some corn kernels to use it in the soup) in a blender with ¼ cup of water or milk. Grind it to a smooth paste.

Heat a pan with a teaspoon of butter add finely chopped garlic. Stir it for 2 minutes.Then add sweet corn paste and bring it to a boil in low flame.

Now add the remaining milk/water and bring it to a boil again. After that add in required salt, oregano & pepper powder.Give a quick stir.

Add corn flour in 2 tablespoon of milk and mix well without lumps. Then add the corn flour mixture to the soup and boil it for 2 minutes. Switch off the flame once done. This is an optional step.