Keep all the ingredients ready on the table. First dry roast both the dals individually.
Dry roast the chilies in the heat of the pan, or else they might burn. So, take care while roasting chilies.
Transfer all the roasted ingredients to another clean plate.
In the same pan, add 1 teaspoon of oil and add the freshly grated coconut and roast it until the moisture evaporates and the coconut becomes a bit dry.
Finally roast the curry leaves until dry.
Transfer the roasted coconut and the curry leaves to the same plate as rest of the ingredients to this now add asafoetida/hing, salt and tamarind.
Let these roasted ingredients cool down well.
Now in a mixer jar , take all the contents except the coconut and grind it to a coarse powder.Transfer this coarse powder to a flat plate.
Now take equal amounts of coconut and ground coarse dal mix in the mixer and grind again for the dal and coconut to mix well.
Take care not to grind continuously. Grind it in pulse motion, 4-5 pulses, remember the dal is already ground coarsely.
Do this in batches, for the above said amount we did it 3 batches in the medium mixer jar of preeti mixie.
Once done, transfer the podi to another clean vessel and give it a good mix.Let it sit and cool well. Transfer the thengai podi to air-tight container and enjoy it with steaming hot rice.