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Knead together the flour, yolks, margarine, yeast, water and 1/2 cup of the sugar.
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Divide the dough into 3 parts and roll old into oven-tray-sized rectangles on floured parchment paper.
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Whip up the egg whites until stiff and gradually add the remaining 1.5 cups of sugar until shiny. Keep the mixer running as you add the instant coffee granules.
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Spread half of the coffee cream on the first layer of dough, lay another layer of dough on top of the cream, spread a second layer of cream on top of it, and cover with the last layer of dough.
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Bake for about 30 minutes at 325 degrees Celsius.