Grease a springform pan (26 cm Ø; approx. 8 cm high) and dust with flour. Peel, quarter, core and roughly dice apples. Mix with lemon juice and 2 tbsp. sugar
Separate 3 eggs. Chill 3 egg whites. Cream fat, 100 g sugar, vanillin sugar and 1 pinch of salt. Stir in 2 eggs and 3 egg yolks separately. Mix flour and baking powder and stir in alternately with rum in portions. Brush into the mould. Spread the apples on top, pressing them slightly into the dough. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for approx. 30 minutes
Beat 3 egg whites and 1 pinch of salt until stiff. While continuing to beat, add 175 g sugar and continue beating until it is completely dissolved. Fold in 100 g grated coconut. Spread on the cake and sprinkle with 1 tbsp. grated coconut. Bake at the same temperature for about 10 minutes. Let it cool down. Dust with icing sugar