Drain the pineapple and cut into pieces, except for 1 1/2 rings. Cream 125 g butter and 125 g sugar. Stir in eggs one after the other. Add rum flavour and 2 tablespoons of milk.
Mix flour and baking powder and stir in briefly. Put half of the dough into a greased springform pan (26 cm Ø) and smooth it down. Stir cocoa into the remaining dough and spread carefully on the light-coloured dough.
Spread the pineapple pieces on the dough and bake in a preheated oven (electric: 175 °C / gas: level 2) for approx. 40 minutes. Let it cool down. In the meantime, stir the pudding powder, coconut liqueur and remaining sugar until smooth.
Bring the remaining milk to the boil, stir in the pudding powder and bring to the boil again. Place in a bowl, cover surface with cling film and allow to cool. Whip the rest of the room-warm butter until creamy.
Stir the pudding again and stir it into the butter by the spoonful. Spread butter cream on the cake and refrigerate for about 2 hours. Coarsely chop the chocolate coating and melt it on a hot water bath.
Spread the couverture evenly on the buttercream and decorate with a cake comb wave-like. Refrigerate the cake again until the icing is firm. Remove the cake from the mould and just before serving, decorate with the remaining pineapple, cocktail cherry, shredded coconut and mint.
Results in about 16 pieces.