Wash the basmati rice in cold water very well and soak this for 30 minutes.
Take a cooker. Heat oil.
Add chopped onion in hot oil and fry it till golden.
Then add ginger and garlic paste. Mix it for 3 minutes.
Now add biriyani masala, red chilli powder. Mix this very well.
Then add the minced mutton and some salt. Mix this very well.
Add the curd. Mix it very well.
Add some water, green peas, pinch of sugar and cook this till two whistles. Keep some gravy in the curry.
Now take another vessel. Boil lots of water.
Add 2 Tablespoons of salt and whole spices in boiling water. Let them boil for 2 minutes.
Then add the soaked rice.
When the rice will become 80% soft, drain all water.
Now take another pan. Put the layer of minced meat curry and then put the layer of rice.
Spread saffron soaked milk, fried onion, mint coriander leaves, ghee and kewra / rose water all over the rice.
Cover the pan with a tight lid and turn on the gas.
Keep the gas on high flame first for 4 minutes, then bring it low for another 15 minutes.
Let it rest for 10 minutes then open the lid.