
icing:
grease and line a spring form cake tin. heat the oven to 190 ˚C.
melt the chocolate and butter in a bain-marie. combine well and leave to cool. add 6 egg yolks and combine well.
whisk the egg whites until stiff. gradually whisk in the sugar until the mixture is smooth and glossy.
fold the egg whites into the chocolate mixture and pour into the prepared tin.
bake for 25 minutes. cover the top of the cake with baking paper and bake for another 25 minutes.
the cake is done when a skewer inserted into the middle comes out clean.
leave to cool in the tin. the middle of the cake will sink a little.
make the icing by melting the chocolate and butter and combining them well.
cover the top and sides of the cake with the icing. serve when the icing is firm.