Take urad dal and put on a clean kitchen towel.
Just rub the dal to clean it because for making this recipe, dal is not to be washed.
Thereafter transfer dal to a kadai preferably iron kadai.
Roast the dal on low to medium heat for 5 minutes while stirring continuously.
Remove the dal from kadai and let it cool down completely.
In the meantime, take a mortar and add coriander seeds, cumin seeds, ginger, garlic and green chilies.
Crush to coarse paste. Keep aside.
By now, the dal must have been cooled completely. Put the dal in grinder jar.
Grind coarsely.
Add mustard oil in the same kadai.
When oil smokes, add mustard seeds.
NOTE : Traditionally Jakhya (Black Jakhia Seed) or Jakhiya, also known as wild mustard or dog mustard is added in it. But if it not available, you can go for mustard seeds or rai.
When mustard seeds crinkle, add the paste and turmeric powder
Saute until the paste turns slightly brown.
Then add grinded dal and whole wheat flour.
Roast for 4 to 5 minutes.
Then add hot water gradually and keep stirring to avoid formation of lumps.
Lastly add salt and mix.
Then put a lid and cook for 20 minutes.
However in between keep stirring the dal at the intervals of 2-3 minutes to avoid sticking of dal to the base.
Finally put some coriander leaves and enjoy.