Cream fat, sugar, vanillin sugar, salt, cinnamon and lemon peel. Stir in the eggs bit by bit. Mix flour, nuts and baking powder and stir into the fat-egg mixture. Chop the plums and fold into the dough with the candied orange peel. Grease a box form (30 cm long) and sprinkle with flour. Fill in the dough. Bake in a preheated oven (electric: 175 °C/ gas: level 2) for 60-70 minutes.
Cover the cake if it gets too dark. Remove the cake and let it rest in the pan for 10 minutes. Turn out onto a kitchen grid and let it cool down completely. Stir lemon juice and icing sugar until smooth and cover the cake with it. Halve the orange slices and decorate the fruit cake with them. Sprinkle with hazelnut leaves and let the icing dry completely
Preparation time approx. 1 1/2 hours (without waiting time). (with 18 slices)