Instructions: Grease a 20 cm ring pan, line base with paper and grease paper. Preheat oven to 200 c.

Cream butter and sugar until light and fluffy, beat in eggs, one at a time.

Stir in potato with half the sifted flour and cocoa and half the milk, then add remaining flour, cocoa and milk. Spread into prepared pan. Bake for about 40 mins. Stand 5 mins before turning onto a wire rack to cool. Spread cold cake with frosting. Frosting: Beat butter until creamy. Gradually add the icing sugar and cocoa and milk. Beat until frosting is spreadable.

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