method
1. Butter and line two 20 cm (8 in) spring form tins.
2. Beat the caster sugar and egg yolks until thick, pale and creamy.
3. Beat in the citrus zests. Slowly pour on the butter while still beating, taking care to leave the creamy sediment in the bottom of the pan.
4. Whisk the egg whites into firm peaks and lightly fold them into the mixture, in three stages, alternating with siftings of potato flour.
5. Divide the mixture equally between the two baking tins. Bake at 180°C (350°F) Gas 4 for 30 minutes until golden and shrinking slightly from the sides of the tin. Leave to cool on wire racks.
6. Meanwhile, prepare the syrup. Dissolve the sugar in the water over gentle heat and boil to a 'thread stage', that is, when the syrup will form thin threads across the opened blade points of a pair of scissors, at 102°C ( 215°F).
7. Draw off the heat, stir in the lemon and orange juice, and finally the rum. Leave to cool.
8. As soon as the cake layers have cooled, prick them all over with a fork and brush liberally with the rum syrup. Place one layer on a wire rack and spread the apricot jam all over, sandwich with the other cake layer.
9. Make the punch icing and pour it straight over the cake. Smooth the sides using a palette knife but avoid touching the top. While still warm decorate with small pieces of candied orange and lemon peel.
10. Leave to mature for a day before cutting.
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