Now put it in water and let it boil for 5 min and rit.
This would reduce the bitterness. Now put it in a bowl and add tamarind paste, jaggery, chilly powder, turmeric powder and some salt along wit a little water and let it boil for a while till it gets cooked.
Drain it again and keep it aside.
Now soak the thoor dhall in water for one hour. Grind tur dal, coconut, red chillies, cumin, asafoetida, turmeric powder and salt coarsely.
Do not add water while grinding.
It should be like vadai batter.
Now stuff the contents into the slit bitter gourd.
Deep fry the stuffed bitter gourd in oil till both the contents and the bitter gourd get cooked.