Spicy Fish curry (Maalu ambul thiyal)

Ingredients: Tuna fish – 1 kg         Dried¬†Garcinia gummi-gutta (Goraka in Sinhalese) – 8 pieces       Pepper seeds – 3 table spoons       Chilli powder – 1 tea spoon       ¬†Garlic – 3 pieces       Curry leaves – 1 sprig       Ginger…