First for making the outer wrap : Take maida in a bowl, add oil and salt, Mix well then add water little by little.
Form a soft pliable dough just like chapathi dough. Allow it to rest for an hour. Meanwhile lets get on to make the pooranam(inner filling).
For the inner stuffing : Dry roast channa dal till a nutty aroma comes, don't let it brown. Then soak it in water for at least 1 hour.
Then cook channa dal with water until soft but not mushy(It should still be in shape if you press it). Drain water from channa dal and keep aside.
Dry roast coconut till the moisture leaves. Grind channa dal with jaggery to a coarse mixture- Use the pulse option in your mixer just pulse it few times.
Add roasted coconut, cardamom powder to the grind channa dal jaggery mixture. Make small lemon sized balls and keep it ready.
Now pinch equal sized balls(slightly bigger than the channa dal balls) flatten it a bit. Then keep the sweet ball in the center.
Seal it completely by pulling the sides to center just like how we make for stuffed parathas. Then flatten it slightly. Dust flour if needed.
Roll it to a thick or thin poli. Heat tawa carefully place the poli on the tawa, drizzle oil and cook the poli on both sides until brown spots appear. Serve hot with a teaspoon of butter or ghee.