Marinate cleaned mutton pieces with lemon juice, fennel powder, garam masala, turmeric powder, kashmiri chilli powder, coriander powder and salt.
Heat 1 tbsp oil in a pressure cooker. Add sliced onions and cook till it browns.
Add marinated mutton pieces, curry leaves and 1 tbsp crushed pepper powder. Give a good mix and cook on low flame for 4-5 mins. Add 1 cup water and bring it to boil.
Pressure cook the mutton till it's done and the gravy is thick. Refer notes.
Heat 1 tbsp oil in a wide pan. Add sliced shallots, crushed ginger & garlic and curry leaves. Cook till it browns.
Add 1.5 tsp crushed pepper powder and fry for a min.
Add cooked mutton along with the gravy and give a good mix. Cook on lowest flame for 7-10 mins until the gravy is almost dried and mutton is roasted well.
Switch off the flame and let the curry rest for half an hour or so for the flavors to settle in. Serve hot with rice, appam, chapathi etc;