Wash dal in several changes of water and let it soak for 15 mins.

Now take in a pot and add water, tomatoes and green chilli and bring it to a boil. Cover and simmer for 20-25 mins until the dal is cooked completely..It should be completely mushy.

Now add salt and mix well..Keep this in simmering..Adjust the water level if you need..

Heat a tawa or kadai. Add oil in it. Add mustard seeds , cumin seeds, fenugreek seeds, dry red chilli, curry leaves, turmeric powder, chilli powder, coriander powder and tomatoes. Mix this for a min.

Pour this seasoning over the dal and mix well.

Let it simmer for 5 more minutes.

Serve with a bed of rice or roti.