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Cream butter and sugar together until light and fluffy.
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Add eggs, beating in one at a time.
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Sift over flour and baking powder and fold into butter mixture.
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Divide the mixture in half. Place one half in a separate bowl and mix in vanilla. Sift cocoa over other half of mixture and fold inches.
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Place alternate tablespoon of mixture into a baking paper-lined 20cm cake tin.
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Swirl the mixtures together with wooden skewer.
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Bake at 180 C for 35 - 40 minutes or until cake springs back when lightly touched.
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Cool cake a little. Turn out onto a cake rack and ice when cold.
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Icing: Melt butter and chocolate over a low heat, stir in icing sugar.
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Add water and mix to combine. Spread over cake when cool.
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If you wish to decorate the cake, use a potato peeler and peel white chocolate into curls and sprinkle over icing.