Place a pan on the clay stove.
Coat the boiled duck eggs with salt, turmeric powder, and red chili powder.
Pour oil into the pan. Add the eggs to the hot oil and pan-fry them.
Take them out and transfer them to a plate once lightly fried.
Add bay leaves, cumin seeds, cinnamon sticks, and green cardamom to the pan.
When the whole spices start releasing their flavors, add chopped onions and fry them until golden brown.
Add tomatoes and a little bit of salt. Give them a good stir.
Once the tomatoes become soft, add ginger-garlic paste and stir well.
A thick paste will form. Add turmeric powder, red chili powder, Kashmiri red chili powder, coriander powder, and cumin powder. Mix well.
Add a little bit of water and sauté the spices.
Then add more water according to desired gravy consistency.
After the water comes to a boil, add lightly fried boiled duck eggs and salt.
Once the gravy thickens, add roasted cumin powder and mix well.
Sprinkle coriander leaves and pour the Haser Dim Kosha into a serving bowl. Serve it with steamed rice, jeera rice, pulao, hot roti or paratha, or naan.