Wash and Soak the Basmati rice for atleast an hour or two.
In a Pressure cooker, fry the potatoes till golden brown. Set them aside. Add some more oil and fry the onions till brown. Take half of them out for later use.
Add whole spices and saute Mutton. Add Ginger Garlic paste. Saute for 2 mins. Add turmeric powder, salt and saute for 15mins or till water dries up. Add 11/2 Cups of warm Water. Close the Cooker Lid and cook the mutton on medium heat for 3 Whistles or till it's almost cooked 90%.
Open the lid and continue cooking. Add Potatoes, some fried onions, remaining spices and saute for 2 mins. Add the tomatoes, sugar and cover lightly. Cook till tomatoes soften and potatoes cooked.
Add the curd and cover cook for 2 mins. Add Lemon juice. Check salt at this stage. Ensure gravy is neither too watery or too less for dum.
Boil the water for Rice with spices, salt and ghee. Add Lemon juice and few drops of Kewra water. Once boiling add the drained rice and cook on high flame for 10-12 mins. Check if it's almost cooked 90%. Keep aside.
Transfer the cooked mutton gravy to the biryani vessel, add the chopped mint and coriander leaves, fried onions. Layer with the rice. Add the chopped mint and coriander leaves, fried onions and saffron milk and finally red food color. Add Ghee. Cover tightly with aluminium foil then close the lid. Place it on an iron tawa and cook on high flame for 5 mins then low for 15mins.
Keep covered for another 15-20 mins before serving.
Garnish with chopped coriander and Serve it with Raita