Cover and chill in the fridge overnight. To make the glaze, combine the chocolate, butter, milk and honey in a small saucepan and melt over a low heat, stirring until smooth. Cool for 3 minutes ...
Drizzle the sponge with 5–6 tbsp of the cherry syrup, until lightly soaked. Reserve 6 of the cherries for decoration and scatter the rest over the sponge. Pour the chocolate custard on top.