Soak one and a half cup rice three hours before cooking.
When ready to cook, thinly slice one large onion, heat about quarter cup oil really well , add in the onions .. start frying , continue frying until they turn dark brown but not burnt … at this point add half a cup water in the onions and immediately put the lid on for 3 minutes… the steam will force the onions to leave out colour .. it will become dark brown …
Now add in the chicken and start frying it .. until the chicken is almost fully cooked.
add in one and a half tsp salt, quarter tsp garlic paste, you will need some whole spices ( few pieces of clove , peppercorn, bari ilaichi ) if you dont have them , no worries just add half tsp of garam masala…
finally add in three cups water and bring it all to a boil.. then add in the rice and cook it on low medium heat. After the first 10 minutes , cover the pot and reduce flame to minimum and let it all cook .. when rice is fully done … put it on dum ..
Either put the pot in the oven at 55 degrees .. for half hour
or keep a slightly wet kapra on top of the rice and close the lid for 20 minutes , on lowest heat.
Good luck buddy , this is a difficult dish .. so all the best