Heat a thick-bottomed pan, add 1 tbsp oil as it heats add 3 tsp coriander seeds, 1 tsp cumin seeds, ½ tsp black peppercorns, ¼ tsp fenugreek seeds, ½ tsp carom seeds, and roast on low flame for a few minutes
Once the spices start to brown remove them from the flame and transfer them to a plate
To the same pan add 8 to 9 byadgi red chillies and fry well until the red chilli puffs up
Transfer the fried chillies to the same plate
In a blender transfer, all the roasted ingredients add ¼ tsp turmeric powder, ½ tsp fish masala powder, 1 cup grated coconut, 1 lemon-sized tamarind, and 5 to 6 garlic cloves, and grind them with enough water into a fine paste
To the masala paste add ½ thinly sliced onion and mix well
Heat a deep-bottomed pan or an earthen pot add the masala paste, the required amount of water, and ½ tsp salt and cover and cook on medium flame
When the masala starts to boil add the fresh cut and cleaned 500 g fish and gently mix the masala
Cover and cook for 8 to 10 minutes on low flame
Add salt if required, do not mix the curry vigorously
Hot and spicy fish curry is ready to savour with rice, dosa, or neerdosa