Soak the Bengal gram lentils (chana dal) in about 1/2 a cup of water for about half an hour. Drain the water and keep aside.
In a small pan, roast the cumin seeds over, low heat until it gives off an aroma. Do not brown. Grind this with the green chillies and coconut with just enough water to a smooth paste. You can add the cumin seeds as they are, but roasting them gives the u201ccurryu201d a better flavour and taste. Keep this paste aside.
Steam or cook the cubed kohlrabi in the microwave until done. If you donu2019t want to steam cook or microwave the kohlrabi, follow this procedure.
Take a largish pan and heat the oil. Add the mustard seeds and let them splutter. Add the black gram lentils (urad dal) and stir fry till they turn golden. Then add the cubed kohlrabi, the drained Bengal gram lentils (chana dal), turmeric powder, curry leaves, salt and a cup of water. Bring this to a boil, turn down the heat and cook till the kohlrabi is done.
If you have steam cooked or microwaved the kohlrabi like I do, then follow this procedure. As above, take a largish pan and heat the oil. Add the mustard seeds and let them splutter. Add the black gram lentils (urad dal) and stir fry till they turn golden.
Add the cooked kohlrabi, the drained Bengal gram lentils (chana dal), turmeric powder, curry leaves, salt and sprinkle a little water. Stir everything together, and cook for a couple of minutes on medium heat.
Whichever method you used to cook the kohlrabi, from here the method of cooking is the same. Add the spicy coconut paste and mix well. If the vegetable-coconut paste looks very dry, add about 1/8th (or a little more, if necessary) of a cup of water and cook for another couple of minutes till it comes together. The u201ckootuu201d should have the finished consistency of vegetable coated with a thick gravy and should not be watery.
Transfer the kootu to a serving dish and add the coconut oil (if using), then cover the dish and let it sit for about 15 minutes to allow the flavour of the coconut oil to develop. Remove the lid, mix in the coconut oil and serve hot with rice, as a side dish.