Soak basmati rice in lukewarm water for 30 minutes.
Boil water with basmati rice ingredients and soaked basmati rice. Boil for 12 minutes in high heat.
After 12 minutes turn off the heat, remove basmati rice from pot and drain.
Mix mutton leg with mutton curry ingredients on the pressure cooker and cook for 20 minutes.
After 20 minutes, turn off heat then transfer mutton curry to a pot and carefully layers it with basmati rice without breaking the rice.
Pour half of the ghee and sprinkle half of the fried shallot and half of coriander and mint leaves over basmati rice. Repeat the layers.
Cover it with a lid and cook at low heat for 10 minutes.
After 10 minutes, turn off heat and open the lid then transfer the mutton biryani into a plate.