Step 1

Cut cake in half horizontally. Spread base with jam. Spread remaining half with cream. Sandwich together. Place on a baking tray. Chill 15 minutes, until firm. Cut into 15 even squares.

Step 2

In a large heatproof bowl, sift together icing sugar mixture and cocoa. Gradually add milk and melted butter. Mix until smooth. Place over a saucepan of gently simmering water and heat gently, stirring, until mixture thickens slightly and coats the back of the spoon.

Step 3

Using forks, coat squares in icing. Drain off excess and roll in coconut. Place on a wire rack. Chill until set.