For the base, finely crumble the sponge finger. Melt 125 g butter. Mix sponge cake crumbs and melted butter well. Line a springform pan (26 cm Ø) with baking paper. Close the rim of the springform pan around it. Pour the sponge mixture onto the base and press down.
Put the base in a cool place for about 1 hour. Stir some orange juice and starch until smooth. Bring orange, lemon juice, vanilla sugar, sugar and 25 g butter to the boil in a saucepan. Stir in well mixed starch. Bring to the boil while stirring constantly. Leave to swell for approx. 4 minutes over low heat and stirring several times. Whisk the egg yolks with a fork. Remove the pot from the heat and stir in the egg yolk. Spread the curd evenly on the base. Refrigerate for another 4 hours. Then remove the cake from the pan with a sharp knife. Coarsely crumble 2/3 of the meringue.
Whisk the egg yolks with a fork. Remove the pot from the heat and stir in the egg yolk. Spread the curd evenly on the base. Refrigerate for another 4 hours. Then remove the cake from the pan with a sharp knife. Coarsely crumble 2/3 of the meringue. Spread the meringue on the curd. Serve decorated with lemon balm and orange wedges
5 hours waiting time