In a Kadai or wok, heat the oil and add the mustard and fenugreek and wait thill they splutter. Then add the garlic and the curry leaves. Add the onions and fry till transparent.

Add ginger garlic paste and then add tomatoes. Fry nicely. Add the turmeric powder, chilly and coriander powder. Add the green chillies and coriander leaves. Fry well and when oil stands on top, add the tamarind juice and salt. Allow the gravy to boil for 10 minutes on sim and then add fish. Once fish is cooked remove and garnish with coiander leaves.