In a large thick bottom saucepan (you can use the same vessel used for boiling rice), add marinated mutton evenly as the first layer followed by half of the cooked rice as the second layer. Watch the video on my youtube channel to see the steps.
To this rice layer, drizzle half of saffron rose water flavored milk, a handful of chopped coriander and mint leaves, and a handful of fried onion evenly.
Now spread remaining rice as the third layer followed by saffron rose water flavored milk, a handful of chopped coriander and mint leaves, a handful of fried onion, and also 1 teaspoon of shahi jeera over the final layer.
Finally, drizzle a generous amount of melted butter or ghee over the biryani to make it more aromatic.
Roll out the wheat flour dough into a rope shape and seal the biryani vessel and the lid in such a way that no steam escapes or leaks. And also place a heavy object on the lid after sealing.
Place the saucepan on a flat thin pan or a biryani dum pan and slow cook the biryani for 75 minutes.
Turn off the gas and let it cool for 10 minutes before opening the sealed lid.
Serve the biryani hot with raita.