Heat a pressure cooker with oil, saute the finely chopped onion juliennes tills lightly brown.
Then add the slit green chilies, ginger garlic paste and saute well for a couple of minutes.
Then add brinjal juliennes, and saute for few minutes.
Add salt and turmeric powder, simmer till the brinjal gets slightly cooked.
Now add the drained cooked chana. Combine well and add the spice powder along with red chili powder and tamarind extract. Let it come to a boil, this might take about 2 to 3 minutes.
Add the drained rice and 2 cups water.
Combine everything and cover with the lid and cook for 3 whistles.
Once the pressure falls down, garnish with coriander leaves and serve with onion raitha.