Knead the fat, flour, almonds, egg yolk, 100 g icing sugar and vanillin sugar with the dough hooks of the hand mixer. Cover and chill for approx. 30 minutes. Quarter the dough and roll out 1/4 of each dough on a greased base of a springform pan (28 cm Ø).
Prick several times with a fork and bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 10-15 minutes until golden brown. Let cool on a cake rack. Beat the egg white until very stiff.
Sieve 75 g icing sugar and fold in carefully. Pass the jam through a sieve. Add 150 g to the beaten egg white and mix to a creamy mixture. Spread 3 cake bases with it and place them on top of each other.
Cover with the fourth bottom. Stir 200 g icing sugar, remaining jam and lemon juice until smooth. Spread the cake all around. Decorate with almonds and chopped apricots and leave to dry.
Makes 12 pieces.