Heat a kadai, with oil on medium flame, to this add the cumin seeds, star anise, cinnamon stick and dry red chillies.
Once these spices begin to sizzle, add in the sliced onions and cook until they turn into a deep brown colour.
This will take a good 8-10 minutes. Once done turn off the heat and set aside to cool.
Once the onion mixture has cooled to room temperature, transfer it to a mixer jar and grind to a fine paste using very little water.
Transfer this to a bowl and set aside.
In the same, kadai, add the tomato puree, and allow it to come to a single boil, now add in the freshly ground onion paste and whisked yogurt, mix well,
Now add the red chilli powder, garam masala, coriander powder, cumin powder and salt to taste. Add the precooked pomfret fish and allow the Lagan Ki Machli to come to a boil.
Once the Lagan Ki Machli comes to a boil. Turn off the heat. Mix in the coriander leaves and serve hot.
Serve Lagan Ki Machli along with Cheese Garlic Naan Recipe or Dhaba Style Spicy Ghee Rice Recipe Made From Whole Spices, Pickled Onions for a complete meal.