Line the bottom of a springform pan (26 cm Ø) with baking paper. Separate the eggs. Beat the egg whites and 1 pinch of salt until stiff, adding 100 g sugar. Fold in the egg yolks one by one. Sift flour, starch and baking powder on top and fold in.
Spread into the springform pan. Bake in the preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/ gas: level 3) for about 20 minutes. Let it cool down.
Cut the sponge cake base 2 x horizontally. Cut the upper cake base into 8 cake pieces. Cut the second cake base into strips about 5 cm wide. Line a bulbous bowl (approx. 26 cm Ø; 3.5 l capacity) with cling film.
Line the bowl with the sponge triangles. Line the top edge with the sponge cake strips.
Finely chop the candied orange and lemon peel. Finely dice dates and apricots. Put 1 cinnamon star aside for decorating. Chop the rest of the cinnamon stars coarsely. Soak gelatine in cold water. Mix yoghurt, 100 g sugar and vanilla sugar.
Squeeze the gelatine, dissolve at low heat. Stir in 3 tbsp. yoghurt, then stir into the remaining yoghurt. Chill for about 10 minutes until the yoghurt begins to gel.
Whip 400 g cream until stiff. Carefully fold the cream first and then the finely chopped fruit and cinnamon stars into the yoghurt.
Pour yoghurt cream into the bowl and smooth it down. Place the last sponge cake base on top and press down. Chill for at least 4 hours, preferably overnight.
Crumble the meringue and whip 200 g cream until stiff. Turn the cake over and remove the foil. Spread the cake with the cream, sprinkle with the meringue crumbs and press lightly. Decorate with 1 cinnamon star and dust with a little cinnamon shortly before serving.