Add the remaining turmeric powder and red chili powder, along with the sugar, to the oil directly and stir vigorously.
Temper with red chili, bay leaf, cardamom, and cinnamon.
This will enhance the flavor and color.
Add chopped onion and fry on medium flame till the onion changes color to brown.
Now add the remaining ginger and garlic paste, and also the grated tomato, followed by ½ teaspoon salt.
Keep the flame medium and cook till the mixture starts releasing oil from the side.
This will take around 5 minutes.
Now add 2 tablespoon of the Spice mix and cook for 3-4 minutes on medium flame.
Add plain curd after beating it with a spoon so that it is smooth.
Mix well and cook for 3 minutes more.
Keep the flame low.
Now add the marinated mutton along with the potatoes and also the remaining marinade from the pan.
Mix well and cook on a low flame.
For the next 15 minutes stirring once in a while.
You will see the oil floating from the side by this time.
Meanwhile, boil 500ml of water separately.
Add the boiling water to the pan containing meat and potatoes and mix well.
At this point, add green chilies as well after cutting them in half.
Now, check one spoonful of gravy for the flavors.
Cover the pan with a lid and keep the flame low.
Cook on low flame for 1 hour.
In between the meat will release sufficient moisture.
Check whether the meat is cooked properly or not. If not, keep cooking for 15 more minutes on the low flame.
Once done, switch the flame off.
The gravy will be a bit runny yet rich. It should not be thick.
The potatoes will be well-cooked yet whole.
Serve it after giving a rest of 15 minutes with Rice, Roti, Poori, or Pulao.