I found this recipe on a blog written by a Lithuanian woman now living in India, "Virtuve su indisku prieskoniu". Jurate's husband's family is from Kerala, which is where this recipe originated. The original recipe did not have spinach, but Jurate recommends it. I did not have the red pumpkin, so used a sweet potato, which worked out quite well. I also used medium shrimp, as I have never seen prawns in my area. I took some liberties in converting the metric measurements into US, and you should know that these slight variations make little difference.