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 :@: