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Preheat the oven to 180°C or Gas Mark 4. Grease an 18cm cake tin and line the bottom with greaseproof paper.
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Sieve both the flours and the baking powder into a large bowl or food processor.
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Add the butter, sugar, vanilla essence and 1 tablespoon of the milk. Mix thoroughly.
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Whisk the eggs lightly and pour into the mixture, mixing thoroughly again.
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Separate the mixture into 3 bowls. Add a few drops of pink or blue food colouring to one bowl and mix together. Add the cocoa powder and 1 tablespoon of milk to the second bowl and mix well. The third bowl should be left plain.
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Put a tablespoon of the plain mixture into the cake tin, then a spoonful of the chocolate mixture by the side of the plain, then a spoonful of the coloured mixture. Repeat until all the mixture is used up.
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Using a knife or skewer, gently swirl the mixtures together to create a marble effect.
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Bake for around 45 minutes until well risen and firm to the touch. Leave to cool in the tin then turn out onto a serving board or plate.
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Make up the buttercream and add a few drops of yellow food colouring. Smooth over the cake and decorate with sweets.
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