South Indian inspired mutton stew with coconut milk and curry leaves

1. Marinate leg of a goat(cut into curry pieces) with salt, pepper, turmeric, cumin powder, coriander powder, and lemon juice overnight.
2. Slice 1 large red onion, fry with mustard oil in a frying pan with curry leaves, 1 bay leaf, an inch of cinnamon stick broken into smaller pieces. 
3. Grind coriander seed, peppercorn, fennel. Use 1 tsp each. Adjust according to taste. 
4. Add ginger paste and slit green chilies. Quarter potatoes, sprinkle salt and saute until the oil separates.
5. Transfer the meat to a pressure cooker. Cook till done. Add a dollop of desi ghee if you want.