1Rinse the chana dal thoroughly under cold water and soak it in water for at least 1 hour.
In a pot, heat the vegetable oil over medium heat.
Add the chopped onion and sauté until golden brown.
Add the cumin seeds and stir for about 30 seconds until they release their aroma.
Add the chopped tomatoes, turmeric powder, red chili powder, and salt. Cook until the tomatoes are soft and the oil starts to separate from the mixture.
Drain the soaked chana dal and add it to the pot. Stir well to coat the dal with the spice mixture.
Add enough water to cover the dal, bring to a boil, then reduce the heat to low and cover the pot. Let it simmer for about 30-40 minutes or until the dal is tender.
Add the chopped green chilies and cook for another 5 minutes.
Garnish with fresh coriander before serving.
Serve hot with rice or naan.