01 - Blend dried and fresh chilies, shallots, garlic, lemongrass, galangal, turmeric, candlenuts, and belacan into a smooth paste. Add a splash of coconut milk if needed to blend.
02 - Slice the fish into small pieces or coarsely mince. Set aside.
03 - In a large bowl, whisk coconut milk, egg, rice flour, salt, and sugar until smooth.
04 - Stir the spice paste into the coconut milk mixture until thoroughly combined.
05 - Add fish pieces and shredded kaffir lime leaves to the mixture, folding gently to coat.
06 - Lay out a piece of banana leaf, shiny side up. Spoon 3–4 tablespoons of the fish mixture onto the center. Fold the sides over to enclose and secure both ends with toothpicks or staples, forming a small parcel.
07 - Repeat with remaining mixture and banana leaves.
08 - Grill parcels over medium-high charcoal or a grill pan for 7–8 minutes on each side, or until the custard is set and fragrant. Alternatively, steam parcels for 15–18 minutes until firm.
09 - Serve hot or warm, straight from the banana leaves.