Method

• 1.
  Stir crystals with 1 cup (250ml) boiling water in a large heatproof jug with a metal spoon to dissolve. Stir in 200ml cold water, pour mixture into a shallow dish and chill for 1 hour until jelly starts to set.
• 2.
  Meanwhile, cut each sponge cake into 8 wedges, then remove the brown crust.
• 3.
  Put coconut in a shallow dish. Dip each sponge wedge into the jelly mixture, then roll in the coconut to coat.