In a large pot,golden brown the chopped onions in oil/ghee then add in ginger garlic paste, green chillies and saute until fragrant.
Add chicken and fry until color changes.Then add coriander powder,salt,turmeric,Shan Biryani masala, yoghurt and tomato paste.
Cook it on medium flame until all water gets dried and oil comes on top.
Make mixture of lemon, vinegar,tamarind and dried plums and leave it for 15 minutes.Add this mixture in the pot and simmer for 5 minutes,then turn off the flame.
Boil two large potatoes in another pot.
In a cup prepare the food Color mixture with biryani essence, water , food color and saffron.