method
1. Slash the fish 3 - 4 times on each side with a sharp knife. Set aside.
2. Grind the cashew nuts, shallots or onion, ginger, garlic and chilli to a fine paste in a mortar with a pestle or in a food processor. Add the vegetable oil, shrimp paste and sugar and season to taste with salt. Blend, then add the tamarind sauce, tomato ketchup and lime juice and blend again.
3. Cover both sides of the fish with the paste and set aside in the refrigerator for up to 8 hours to allow the flavours to mingle.
4. Wrap the fish in foil, securing the parcels carefully. Bake in a preheated oven at 180°C (350°F) Gas 4 for 30-35 minutes.
serving amount
serves 4
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