Place the slices of chocolate Swiss roll in the bottom of a large glass
serving bowl.
Drain the black cherries, reserving 6 tablespoons of the
juice. Place the cherries and the reserved juice on top of the Swiss roll slices. Sprinkle with
the kirsch.
In
a heatproof bowl, mix the corn flour and caster
sugar. Stir in enough of the milk to mix to a smooth paste. Beat in the egg yolks and the whole egg.
Heat the
remaining milk in a small saucepan until almost
boiling, then gradually pour it on to the egg mixture, whisking well until it is combined.
Place the bowl
over a pan of hot water and cook over a low heat
until the custard thickens, stirring. Add the chocolate and stir until melted.
Pour the
chocolate custard over the cherries and leave to
cool. When cold, spread the cream over the custard.
Chill thoroughly, decorate with the
maraschino cherries and serve.