Take 750 grams of mutton in a bowl and add 2 tbsp of mustard oil, ½ cup of plain yogurt, salt to taste, and 1 tbsp of lemon juice into it; mix them all nicely and keep the bowl aside to marinate. (Pro tip: Marinate mutton in the marination ingredients, preferably overnight or for a minimum of 3 hours, for best results).
Now, take ¾ cup of plain yogurt in a bowl and add 3 tsp of Kashmiri red chili powder, ½ tsp of green cardamom (powdered), ¼ tsp of black cardamom (powdered), ¼ tsp of crushed black pepper, 1 tsp of ginger powder, and ½ tsp of fennel seeds (ground) into it. Mix them all nicely to make a paste of yogurt. When done, keep it aside.
Now, in a pressure cooker, heat 2 tbsp of ghee (clarified butter) on a medium flame. When it melts, add 1 piece of cinnamon (2-inch size stick), 2 pieces of bay leaves, and ½ tsp of asafetida (hing) into it. Stir and fry them for about 30 seconds.
At this stage, add the marinated mutton and cook it for about 10 minutes or so on a medium flame.
Then, add 1 tsp of crushed black pepper, 6 pieces of cloves (powdered), ½ tsp each of powdered black and green cardamom, ½ tsp of ground fennel seeds, and salt to taste to the mutton. Mix them all very nicely and let it cook for another 5 minutes or so.
Now, add the yogurt mix you have made already. Mix it nicely with the mutton to notice the lovely change of color, and add 2 cups of water to it. Optionally, you can add 2 pieces of green chilies (broken in halves) into it as well. (Pro tip: While adding the yogurt mix, put a couple of tablespoons first, mix it nicely, and then add the remaining mix).
Cover the pressure cooker with the lid and cook it for up to 3 to 4 whistles.
Once the cover is opened, add a piece of roughly sliced medium-sized onion to it and mix nicely.
Then, sprinkle 1 tsp of garam masala powder. Mix it.
Finally, add a handful of finely chopped fresh coriander leaves and an equal amount of mint leaves, along with 1 tbsp of Kewra water, and mix them all nicely with the gravy.
Your tasty and flavorful homemade mutton rogan josh is ready to enjoy. Transfer it to a serving bowl, garnish with chopped mint and coriander leaves, and serve hot with steamed rice or Indian bread.