Roughly grate the marzipan. 250 g flour, 40 g icing sugar, vanillin sugar, marzipan, butter in pieces, flavour and 1 egg first with the hand mixer, then knead briefly with your hands until smooth
Roll out the dough on a little flour and make it round (about 30 cm Ø). Line a tart mould with a removable base (26 cm Ø) and press the edges into the grooves. Prick the bottom several times with a fork. Cover and chill for about 30 minutes.
Wash, clean, halve and stone the plums. Pre-bake the short pastry in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 10 minutes. Sprinkle breadcrumbs on top. Spread plum thickly on top. Sprinkle with almonds and 2 tbsp. sugar. Continue baking at the same temperature for approx. 20 minutes
Beat 2 egg whites until stiff, while pouring in 100 g sugar. Pour in large stains on the plums. Bake at the same temperature for about 10 minutes. Let it cool down. Dust with icing sugar