Since meat is marinating, meanwhile we can prepare the mixture. What you need to do is;
Take a heavy bottom pot and put it on the stove. Turn on the flame, heat the pan, and add oil. Add Bay Leaves, Cumin Seeds, Cloves, Green Cardamom, and Cinnamon Sticks.
Just after 1-2minutes, add Sliced Onion and Green Chilies. Fry the onion until light golden brown. Take half of the fried Onion, and leave the rest in the pot.
Add the marinated lamb piece and sauté on low flame for 3-4 minutes. Also, add a hand-full fresh Coriander leaves, Nutmeg, and Mace Spice powder.
No need to add water as the mixture contains Papaya paste and curd. Cover the pot and cook on low-medium flame until meat is tender.
Once done, cook the mixture on a high flame to separate the oil and turn off the flame.
Note:Add this point; you can fry the potatoes separately and mix with the ready mixture.