Drain mandarin oranges and pineapple well on a sieve. Beat the fat, sugar and salt until creamy with the whisk of the hand mixer. Gradually stir in the eggs and lemon peel.
Mix flour and baking powder and also stir into the fat-egg mixture. Add sour cream and work into a smooth dough. Put the dough on a greased baking tray and smooth it down. Spread the fruits evenly on the dough.
Bake the cake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 30-40 minutes. Let the cake cool down. Heat apricot jam in a pot and pass through a sieve. Spread the cake with it.
Sprinkle with coconut shavings. Decorate with lemon balm leaves as desired.