Peel, de seed and cube the white pumpkin into 1 inch cubes. Add some water and turmeric powder in a pot and cook the melon in it till it is easily mushed with little pressure. This should take about 8-10 mins.
2 cups cubed winter melon / ash gourd / white pumpkin, ½ teaspoon turmeric powder
Add the green peas to it and let it soften. Add salt to taste and mix well.
1 cup frozen peas, salt
While the melon is cooking, cook the toor dal in a pressure cooker or the Instant Pot. For the Instant Pot, add toor dal, double the amount of water and cook on Manual / High Pressure for 6 mins. Mash the dal till it gets all mushy and add it to the melon and green peas.
1 cup toor dal
Grind the coconut* to a paste along with cumin seeds and dried red chillies. Add this to the dal and melon mix. Rinse out any coconut paste in the blender jar with some water and add it to the kootu. Let it all cook together over medium high heat for 2-3 mins.
1 cup grated coconut, 1 teaspoon cumin seeds, 2-3 dried red chillies
Pop the mustard seeds in hot coconut oil and add the chana dal and curry leaves to it. Once the chana dal starts to turn brown, remove the tadka pan from the heat.
2 tablespoon coconut oil, 1 teaspoon mustard seeds, 5-6 curry leaves, 1 teaspoon chana dal
Pour this tadka over the kootu and mix well before serving.