Set a Kadai over medium heat. Add oil. When the oil becomes moderately hot throw in the whole cumin seeds, dry red chilies & the bay leaf. Allow them to sizzle for a few seconds.
Next, add the chopped onions & saute until lightly golden in color. You may add salt at this stage to quicken the process.
Now, add the chopped tomatoes & saute until completely mushy.
Add the tomato paste diluted with water & give everything a very good mix. You will notice that oil is leaving the sides of the Karahi.
Next, add the spices (turmeric, coriander, cumin & red chili powders) and give everything a good stir until slightly fragrant.
Add the shallow fried prawns & saute them with the bhuna masala until all the prawns are nicely coated with the masala.
Next, add the frozen pearl onions, green bell peppers & ginger julienne & mix well.
Now, add the Kadai masala, kasturi methi & the garam masala & saute until the prawns are well coated with the masalas & the curry becomes fragrant. Do not over fry. It should take you about 2 mins.
Serve hot & enjoy!