I think this will be the best thokku in the world.
The drum sticks must be rich in 'marrow'. Peel the skin of drum sticks and make small pieces of them.
Chop onions. Soak tamarind for half an hour.
Now grind drum stick, onion and tamarind finely.
Pour oil in a deep pan and make seasoning with mustard seeds
Put the mixture in the oil and mix well.
Add fenugreek powder, asafetida powder, red chilly powder, turmeric powder and salt.
Mix them well. Allow it to boil. Let all the water in the mixture disappear.
When oil comes out of the thokku add powdered Jaggery and mix well again.
Remove the Drum stick thokku from the fire and start using immediately.
As usual you can store this in a air tight bottle and keep it for more than a year.