Preheat the oven
to 180'C/3S0'F/Gas 4. Grease and baseline a
20cm/8in springform cake tin.
To make the
frosting, mix together the fromage frais and
mascarpone, add a few drops of vanilla essence and
icing sugar to taste, then set aside.
Whisk the egg
whites until they form stiff peaks. Whisk in 30ml/2
tbsp of the caster sugar until the meringue is thick
and glossy, then fold in the remainder.
Chop 175g/6oz of
the chocolate. Carefully fold into the meringue with
the dates, nuts and 5ml/l tsp of the vanilla
essence. Pour into the prepared tin, spread level
and bake for about 45 minutes, until risen around
the edges.
Allow to cool in
the tin for about 10 minutes, then unmould, peel off
the lining paper and leave until completely cold.
Swirl the frosting over the top of the cake.
Melt the
remaining chocolate in a bowl over hot water. Spoon
into a small paper piping bag and drizzle the
chocolate over the cake. Chill before serving.