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Dough: 500 g of flour 200 g of butter 175 g of sour cream 1 whole egg + 1 egg yolk 1 packet of vanilla 1 pinch of salt 1 teaspoon of powdered sugar Filling: 500 g of hazelnuts 320 g of powdered sugar 2 egg whites half a lemon juice 1 lemon peel 1 package of vanilla