Add the washed green mung beans (cherupayar) to the pressure cooker.
Add enough salt and also 3 cups of water to the cooker, mix well.
Close the pressure cooker with lid and safety valve and cook the contents for about 6 minutes or until one whistle comes (green mung beans cook fast). Wait for the pressure cooker to cool down.
Meanwhile, coarsely grind the coconut, garlic, cumin seeds and green chilies, keep this grind mixture aside.
Once the pressure cooker is cooled enough, open the cooker and add the grind coconut mixture and also the spice powders - turmeric powder and red chili powder to the cooker, gently mix in and cook in low to medium heat for another 2 minutes (no need to close the pressure cooker) and delicious and healthy cherupayar thoran or green mung beans thoran is ready which you can serve with the kanji/rice soup as it is or you can add seasoning also (instructions below) for a traditional Kerala style dinner.