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Preheat the oven to 180°C/350°F/Gas mark 4. Grease and
flour a deep 20cm/8in round cake tin and line the base
with greaseproof paper.
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To make the cake, put the
chocolate and butter into a heatproof bowl and set over a pan of hot water until melted.
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Meanwhile, put
the egg yolks and sugar in a large heatproof bowl, place
over a pan of hot water and whisk with an electric whisk
until very pale and creamy. Remove from the heat and
whisk until cool. Add the brandy and vanilla essence and
whisk in the melted chocolate and butter mixture.
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Add
the sifted flour and the ground almonds and fold in
gently, using a metal spoon. Whisk the egg whites until
stiff then very lightly fold into the mixture, a little
at a time. Pour the mixture into the cake tin and bake
in the oven for 45 to 50 minutes or until firm to the
touch. Cool in the tin for 10 minutes, then turn out and
cool completely on a wire rack.
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To make the icing,
melt the chocolate and butter in a heatproof bowl set
over a pan of hot water. Remove from the heat and
gradually stir in the icing sugar and warm water to make
a thick icing. Keep warm over the pan of hot water until
ready to use.
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Cut the cake in half and spread a third
of the icing over one half of the cake, then top with a
third of the whipped cream. Put the remaining cake on
top. Spoon the rest of the icing over the top and
completely coat the top and sides of the cake. Leave to
set.