Wash and marinate the chicken for 2 hours with curd, vinegar,jeera powder,chilli powder, mustard oil. Cover the vessel and keep it in fridge for 2 hours.

Take water 4 times more than rice in a cooking vessel. Put the cardamom, Cinnamon, bay leaves and salt and bring to boil. Keep this aside and covered

Cut the onions into thin slices. Fry 1 onion till deep brown and keep aside. Fry the potatoes half cut and keep aside

Add some oil and ghee into the pan. Add Jeera and Garam masala into it. Add the remaining onion and garlic and saute it

Add Ginger and garlic paste, tomato pieces and fry it for a while

Once the masala is well cooked, add the marinated chicken into it and mix well. Let it cook covered in low heat

Keep mixing the chicken in between and cook it till the chicken is well cooked. This will take around 45-60 min

Once chicken is soft add the Biryani masala,garam masala and 1/2 teaspoon sugar and mix well and remove

Add the soaked rice into the water prepared in step 2 and let it cook. Once rice is done, keep it aside to cool

Take a separate vessel and put one layer of rice into it. Add 2-3 drops of rose water, some saffron, ghee and meetha atar(essence).Add a layer of chicken and some potatoes on it

Repeat the same for one more layer and cover it. Put the fried onions on top