Fragrant aged basmati rice layered with spiced meat, saffron-infused milk, and sweet caramelised onions, sealed and slow-cooked in dum style.
Mix the chicken with yogurt, ginger-garlic paste, half the birista, and salt; rest 1 hour.
Boil the rice with the green cardamom and salt until 70% done; drain.
Spread the marinated chicken in a heavy pot; top with the drained rice.
Pour over saffron soaked in 1/4 cup warm milk, the kewra water, and ghee; seal the lid with dough.
Cook on the lowest heat 40 minutes; rest 10 minutes before opening.
Flake gently and serve with the remaining birista and raita.