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Preheat the oven to 190°C/375°F/Gas mark 5.
Lightly grease 2 x 20cm/8in shallow round cake
tins and line the bases with baking parchment.
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Sift the flour and bicarbonate of soda together
into a bowl. With a wooden spoon, beat the
butter and sugar together in a bowl until pale
and fluffy.
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Beat in the vanilla essence and the
eggs, one at a time, beating well after each
addition. Add a little flour to the mixture if
it begins to curdle.
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Fold the melted chocolate
into the mixture until well blended. Gradually
fold in the flour, then stir in the buttermilk
and boiling water.
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Divide the mixture between
the tins and level the tops. Bake in the oven
for 30 minutes, until springy to the touch.
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Leave to cool in the tin for 5 minutes, then
transfer to a wire rack and leave to cool
completely.
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Place the icing ingredients in a
large bowl set over a pan of gently simmering
water.
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Whisk, preferably with an electric
beater, until thickened and forming soft peaks. Remove from the heat and whisk until the mixture
is cool.
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Sandwich the 2 cakes together with a
little of the frosting then spread the remainder
over the top and sides of the cake.