Pressure cook dal till done with onions, tomatoes, green chilies, chili powder, turmeric and ¼ tsp of fenugreek seeds.
Heat 1tsp oil in a sauce pan, add mustard and cumin seeds. After the seeds splutter, add red chilies and hing.
Add the seasoning and 1 cup of water to the dal and cook for about 10 minutes on medium flame.
Add lemon juice and chopped coriander after removing from the flame and mix well.