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.Whisk eggs and sugar with vanilla sugar until thick and creamy.
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Add the melted butter and the water to the egg mixture.
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Beat for another minute.
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Sift the flour and gently fold it into the mixture, adding the dates and the chopped walnuts. Add the cinnamon to the mixture.
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Spoon the mixture into a greased tin measuring 28cm x 18cm.
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Bake in a preheated 180C oven for 20 to 30 minutes.
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When ready, the slices will be golden brown on the surface and cooked through when tested with a skewer.
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Prepare the lemon icing.
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Sift the icing sugar into a bowl.
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Add the lemon juice and the softened butter.
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Mix these ingredients together until smooth in consistency.
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When the slices are cool, spread the lemon icing on top.
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Allow to cool.
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Cut into approximately 16 slices.