Cream fat, sugar, vanillin sugar and salt with the whisk of the hand mixer. Add lemon zest and stir in. Stir in the eggs one by one. Mix in flour and baking powder. Grease a fat pan of the oven (approx. 32 x 39 cm) and dust with flour. Add the dough and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 25 minutes.
Mix icing sugar and lemon juice. Take the cake out of the oven and brush with the icing immediately. Allow to dry. Peel lemon carefully so that the white skin is completely removed. Halve the lemon lengthwise and cut into thin slices. Whip the cream until stiff and place in a piping bag with a star-shaped spout. Cut the cake into pieces and decorate some with cream tuffs and lemon slices
Waiting time approx. 1 hour