Marble cake

Preparation

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  Take the whites out of the egg yolks, and whisk them until they are stiff.
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  Add sugar to the yolk and mix well. Add the flour, the baking powder and a pinch of salt, and mix well.
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  Add the melted butter, then delicately add the egg whites to the batter.
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  Divide the batter in half. Add in one half the vanilla sugar, and the melted chocolate in the other half.
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  In a cake mould, pour the batter, alternating between the vanilla and the chocolate batter. Start with vanilla, as chocolate has a tendancy to burn.
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  Bake 50 minutes at 320°F (160°C).
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  There you are, your marble cake is ready !