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.