Firstly fry the fish till crispy. Mackerels is nice for this dish. Remove and set aside.
In a wok, place your oil, fry your garlic, onions and torch ginger, adding the tamarind and water.
Taste and season with soy sauce, sugar and freshly ground pepper. Lastly add in your fresh chillies and spoon on top of fish just before serving.
Top with fresh coriander and serve with plain rice.