You need raw green bananas to make this. There shouldn't be any hint of sweetness.
2 raw green bananas
Dhania (coriander seeds)
Tamarind (optional) (very little)
The ratio of Chana dal, dhaniya, red chilies is 1:1.5:1.5
You steam the bananas, peel them.
Roast the spices
Grind them with tamarind (I didn't use any cos it Tames the spiciness)
Take it out and keep aside
Put the bananas in the mixer.
Now put the spices you ground back in to the mixie and run it one more time.
Just garnish with curry leaves.
Mix with hot rice and eat.
Traditionally they powder this in an ammi (a stone grinder). It's obviously more tastier If hand pounded.