Defrost the puff pastry. Drain the apricots and collect the juice. Finely dice 3/4 of the apricots, cut the remaining apricots into thin slices. Separate the egg. Dice marzipan. Knead with egg white, apricot cubes and 100 g icing sugar with the dough hooks of the hand mixer
Line baking tray with baking paper. Place the dough plates on top of each other. Roll out to a rectangle (approx. 25 x 38 cm) on a little flour. Place on a baking tray, prick several times with a fork and spread the marzipan mixture on top, leaving a rim of about 3 cm on the long sides. Fold both edges of the dough inwards, each approx. 2 cm wide
Sprinkle apricot slices and almonds on the marzipan mixture. Whisk the egg yolks. Spread the edges of the dough with it. Bake in the preheated oven (electric oven: 200 °C/ convection oven: 175 °C/gas: level 3) on the bottom shelf for approx. 35 minutes. Cool down a little. Mix 450 g icing sugar and 1-2 tbsp apricot juice. Spread the edges of the dough thinly. Leave to dry