Cream the fat with the whisk of the hand mixer. Add salt, sugar and vanilla sugar. Stir in first eggs one after the other, then lemon juice. Mix flour, baking powder and sauce powder and sieve over it. Alternately stir in the milk.
Halve the dough. Stir the poppy seed filling into one half of the dough. Grease a 2.5 litre cake tin and dust with flour. Fill in dough alternately by the spoonful. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 1 hour. Remove from the oven and leave to rest in the mould for approx. 10 minutes. Turn out onto a cake rack and let it cool down. Sift icing sugar. Mix with egg white and orange juice to a thick icing.
Remove from the oven and leave to rest in the mould for approx. 10 minutes. Turn out onto a cake rack and let it cool down. Sift icing sugar. Mix with egg white and orange juice to a thick icing. Cover the cake with it. Decorate with orange pieces and lemon balm
waiting time approx. 1 1/4 hours