Soak the dal in sufficient amount of water overnight / 6-7 hours.
In the morning/after 6-7 hours, grind the dal to a paste, neither too soft nor too coarse. Keep aside.
Take a bowl, add whole wheat flour, all purpose flour, baking powder & salt and knead it well with water.
Cover the dough with wet muslin cloth and keep aside for 1/2 an hour on your kitchen shelf.
After half an hour, take the dough, pinch a small ball from it.
Roll the ball with the help of a rolling pin to the shape of a small puri.
Place a teaspoon of the grinded daal in the center.
Cover from all sides and seal well.
Roll it out to the medium size pooris. Dust the flour wherever needed.
Heat oil in a pan and carefully slide the pooris and fry them.
Drain on a kitchen towel.
Your Babru is ready.