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First, wash the fish pieces and mix them with half the turmeric and salt.
Next, peel the potatoes and cut them in half.
Then, thinly slice two onions and mash one onion into a paste.
Heat oil in a pan until it gets hot enough to change color.
Fry the fish pieces in the hot oil over medium heat on both sides.
Take the fried fish out of the oil.
Sprinkle the potato pieces with the remaining turmeric and salt, then fry them in the same oil over medium heat.
Remove the potatoes from the oil once they are cooked well.
In the remaining oil, add Bay Leaf, Dry Red chili, Cinnamon Stick, Clove, Black Cardamom, Green Cardamom, Cumin Seed, and Asafoetida to flavor it.
Add the sliced onions and onion paste and fry until they turn brown.
Put in the ginger paste and garlic paste and cook for one minute.
Add tomato paste, then poppy seed paste and Kismis paste, and cook until the oil separates from the mix.
Also, add the whole raisins.
Add the thick curd and cook on low heat, stirring well.
Put in Turmeric Powder, Cumin Powder, Coriander Powder, Kashmiri Red Chili Powder, Red Chili Powder, Sugar, and Salt, and cook for one minute.
Pour in 3 cups of water, then add the fried fish and potatoes.
Cover and cook on low heat for about 7 to 10 minutes.
After that, add Bengali garam masala powder and then ghee. Mix well.
Serve Macher Kalia (like they make it at weddings) with hot, cooked rice.