Add mutton pieces to pressure cooker with water, black cardamom pods, bay leaves, and 1 tsp salt. Cook until tender (about 20-25 minutes).
While mutton cooks, place whisked yogurt in a heavy-bottomed pan with fennel powder, ginger powder, and remaining salt. Cook over medium heat, stirring continuously to prevent curdling, until volume reduces by half.
Add the reduced yogurt mixture to the cooked mutton and broth. Simmer for 4 minutes, stirring gently.
Add ghee, green cardamom pods, cloves, and asafoetida. Continue cooking until gravy reaches desired thickness.
Stir in dried mint and black cumin, then remove from heat immediately.