In a pressure cooker, add oil. Once hot, add mustard seeds, split urad dal, shallots, curry leaves, vadagam and sauté well.
Once onion turned soft, add all the spice powders and mix well. Let it cook for 2 mins.
Add ginger-garlic paste and mix well. Cook till raw smell goes off.
Add cleaned mutton pieces and castor oil. Castor oil helps in cooking of mutton. Just a tsp of castor oil is good enough. Mix thoroughly.
Add required salt and 1 cup of water. Pressure cook for 6 whistles in high heat.
Let the pressure release naturally.
Add the paste and 2 cups of water to the cooker. Check for salt.
Pressure cook for 2 more whistles.
Switch off the heat.