Wash corn rava and moong dal and pressure cook it for 5 - 6 whistles by adding 3 cups of water. Once done, switch off the flame and keep aside.
Meanwhile, heat oil in a small pan and add jeera followed by pepper corns, green chili, ginger, curry leaves and crushed pepper. Fry it for half a minute in a low flame, remove and keep aside.
Once the pressure gets released, remove corn - dal mixture and mash it well. Add the seasoning along with salt and mix evenly.
Boil 1/2 cup of water and add it to the pongal and mix it again. ( This helps the pongal to maintain its texture and doesn't get hard even after long time ).