Leave to set. Either spray or brush the dark chocolate shards with the gold lustre. Fit a piping bag with a star nozzle and fill with the remaining buttercream. Pipe 6 swirls on top of the cake ...

For the dark chocolate buttercream, repeat the method for the white chocolate buttercream. For the ganache, heat the double cream in a saucepan until just boiling, then remove from the heat.

Terri Stewart’s Dark Chocolate Cherry Surprise Cake ... Frost with layer of chocolate buttercream. Pipe a dam around the cake. Fill center of dam with half of the cherry filling.