Light the clay stove or gas oven, heat the karai, and lightly dry roast the Moong Dal. (Pro Tip: I roast until the dal smells nutty and turns light golden, never brown. It gives a nice color to the dish.)
Soak dry roasted moong dal with one cup of water for 5 mins.
Then add mustard oil in the pan or karai and heat it.
Add the bay leaf, dry chili and cumin seeds.
Add all the ash gourd in the oil. (Pro Tip: Cut the ash gourd into small, even pieces. Big chunks stay raw while the dal turns mushy.)
Stir well and add 1 tsp salt, turmeric, ginger paste, and green chili. Stir fry it well.
Add all the already soaked dal into it after draining the water. Add lukewarm water and let it boil for 5 mins. (Pro tip: Do not add too much water as ash gourd will release its own moisture while cooking).
Add the chopped tomatoes.
Cover it with a lid and leave it for 10 mins.
Add half tsp sugar, then add salt to taste.
Cook it until the water is dried and the chal kumro diye moong dal is well cooked.
Transfer it to a bowl.