One of my fav fish dish in my college hostel...
Mathi/Sardine Fish - 10
Mustard seeds - 1/2 tsp
Fenugreek seeds - 1/4tsp
Small onion /shallot slices - 1/4cup
Ginger slices - 1tsp
Garlic pods/sliced - 6 (small)
Red Chilli powder - 1tbsp
Tamarind water - as needed (or you can use kodam puli)
Salt - as needed
Soak red chilli powder in little water.Fry mustard and fenugreek seeds in hot oil.Add onion slices to this and saute.Once it is almost sauted well, add ginger slices and fry.When this almost fried add the soaked red chilli powder and saute.Add sufficient water to this sauted masala and cook.Add garlic slices,curry leaves,salt and tamarind to this.Once the gravy is cooked well and raw smell of chilli powder is gone, the gravy thickens , plcae fish fish pieces slowly into the gravy and cook with lid half covered.Whenit starts to boil, remove the lid and cook it slowly until the gravy thickens.
Recipe source - K.M.Mathew