After cutting the fruit, take out the watermelon rind ( White region ) . Take off the outermost green skin , as thin as possible and discard it. We would be using only the white part.
Cut watermelon rind into small pieces as shown in pic.
Soak channa dal in little water for 20 minutes.
Cook watermelon rind with little turmeric and water either in a cooker / microwave or directly in the vessel.But don't overcook and make it mushy. It should be about 75 % cooked.
Meanwhile, grind the ingredients mentioned under " To grind " to a very very smooth paste adding little water.
Once the veggie is cooked, Add the ground masala paste and salt to it. Mix.
Boil for a couple of minutes. Add buttermilk/curd and mix such that the masala and buttermilk blends well.Add some water to get the desired consistency. Let the mixture come to a boil, but don't over boil You will see that as it boils, the gravy thickens. Stir for 1-2 mins and switch off.
Heat oil in a small pan. Temper with mustard seeds,hing & curry leaves.When the mustard crackles, pour the tempering over the curry. Watermelon rind majjige huli is ready to serve.
Enjoy it with steamed rice along with some sun-dried chillies / spicy pappad / spicy chutney-.