Peel and cut plantains into chunks. Do the same with yam if you are using any.
Add water in a saucepan along with the chopped plantain and sprig of curry leaves. Add a bit of salt and turmeric powder from the measured amount.
Put the sauce pan over medium heat.
Cook the plantains till they are done. By then most of the water will have evaporated. If you are using yam then add it with the plantain.
While the plantain is getting cooked, get the paste ready.
Grind coconut, green chillis and cumin seeds together in a food processor.
If required add a bit of water.
Add the paste to the yogurt. Add remaining salt, turmeric powder and chilli powder. Whisk it well.
Add the yogurt mixture to the cooked plantain. Reduce the heat and stir the mixture continuously till it becomes thick.
Let it simmer for a few minutes.
Take the pan off the heat.
Get the tempering ready.
Heat ghee in a small pan. Add fenugreek, mustard seeds and red chilis. Then add the curry leaves.
Pour the tempering over the kalan. Serve kaalan with rice or as a part of the sadya.