Drain the tangerines, collecting the juice. Cream fat, 275 g sugar and vanilla sugar. Stir in eggs one after the other. Mix both types of flour and baking powder. Alternately stir in 5 tablespoons of mandarin juice and liqueur.
Fold in the mandarins. Grease a box form (25 cm long) and line it with baking paper, leaving paper protruding from the edge. Fill in the dough and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 60-75 minutes (test with sticks!) Beat the egg whites until stiff, adding 100 g sugar and salt. Remove the cake from the oven. Put meringue mixture on top and spread loosely. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for about 5 minutes. Let cool on a cake rack for about 10 minutes. Remove from the tin with the help of the baking paper and let cool down.
Remove the cake from the oven. Put meringue mixture on top and spread loosely. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for about 5 minutes. Let cool on a cake rack for about 10 minutes. Remove from the tin with the help of the baking paper and let cool down. Dust with icing sugar and decorate with kumquat
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