Grease only the bottom of a springform pan (26 cm Ø). ##Score the vanilla pod lengthwise and scrape out the pith. Warm the milk lukewarm. Separate ##eggs##. Whisk egg yolk and 75 g sugar with the whisk of the hand mixer for about 5 minutes until light creamy.
Stir in the vanilla pulp.
Pour in the milk. Sift flour, baking powder and 1 pinch of salt onto the egg mixture and stir in briefly. Beat the egg whites until stiff, adding 75 g sugar. Fold in the beaten egg white.
Spread the mixture into the mould. Bake in the preheated oven (electric oven: 175°C/circulating air: 150°C/gas: level 2) for about 50 minutes. Let the cake cool in the mould for approx. 10 minutes, then remove from the mould and let it cool down completely.
Dust the cake with icing sugar. If desired, decorate with sugared rose petals and candied violets.