In a mixing bowl, add maida / all purpose flour, turmeric powder and salt. Mix well.
Add ghee and incorporate it well with the flour such that that flour mixture when held together maintains its shape.
Add water, little at a time to form a soft dough. Knead well.
Apply some ghee or oil on the top and cover and rest the dough for 2 hours.
To prepare the filling
Wash and soak the chana dal in enough water for 4 hours.
Drain off the water, add the dal to a pressure cooker and enough water and pressure cook for 2-3 whistles or until cooked.
Once the dal is cooked, pass it through a fine mesh and mash it. You can even grind the cooked dal to a smooth paste.
Meanwhile, add the jaggery and water to a kadai and let it melt.
Pass the melted jaggery through a strainer to remove any debris.
Add the mashed dal and jaggery water to the same kadai and mix well. Cook until it thickens a bit.
Add ghee, little at a time and incorporate it well with the mixture.
When the mixture starts coming off the pan, add the cardamom powder and nutmeg powder. Mix well and turn off the heat. Keep it side to cool completely.
To prepare the puran poli
Divide the dough into eight equal portions. Cover it and keep it aside.
Divide the filling into 8 equal portions after it has cooled down and keep aside.
Grease a cooking sheet or banana leaf with some oil and place one portion of the dough ball, flattening it by keeping the center thick and the edges thin. Place one portion of the filling as shown.
Seal the filling by bringing all the edges together and flatten it slightly.
Apply some oil and spread it with your hand or with the help of a rolling pin.
Heat a tawa on medium heat, place the poli on the tawa and cook on both sides until golden brown.
Add ghee to both sides while cooking.
Serve hot.
Notes
Make sure the dal is cooked until soft.
Also, mash the dal completely after it is cooked to ensure that the filling is smooth.
After kneading the dough, let it rest atleast for 30 minutes.
If you are not soaking the dal, then pressure cook it for 6-7 whistles or until completely cooked.
Turmeric is added just for color. You can replace it with yellow color also.
You can add grated jaggery to the mashed dal directly too.
Instead of ghee, you can also add oil while cooking the puran poli.