For the poppy seed cake, separate the eggs. Beat the egg whites until stiff. Cream butter, powdered sugar, egg yolks and lemon juice. Stir in cinnamon, grated almonds and poppy seeds with the stiffly beaten egg whites.
Finally, stir in the rum. Grease and flour the cake tin. Pour in the mixture and bake at 180°C for approx. 50 minutes (test with a needle).
When cooled, cover the poppy seed cake with chocolate icing.