Soak dry red chilies in hot water for 30 minutes.
Dry roast cumin seeds and fenugreek seeds for 2 to 3 minutes.
In a mixer grinder, add soaked red chilies, roasted cumin and fenugreek seeds, curry leaves, chopped garlic and salt. Grind to a smooth paste by adding ¼ or less water as needed.
Take half of the chili paste and marinate the fish pieces for 1 hour.
Reserve the other half of the chili paste for tawa masala.
Heat a non-stick or cast iron pan with coconut oil. Shallow fry the marinated fish pieces on low flame for 10 minutes on each side.
Remove the pieces on a serving plate and keep warm.
In the same pan, add curry leaves and remaining chili paste mixed with a little water. Fry this masala on low heat for 5 to 7 minutes.
Pour the masala over the fried fish and serve hot by sprinkling chopped coriander and green chilies.
This can be served with dal and steamed rice.