Wash and stone the plums. For the dough, beat the fat, 1 packet of vanillin sugar and 75 g of sugar until fluffy. Grate marzipan and stir well. Stir in the eggs bit by bit. Mix flour and baking powder and stir into the fat egg mixture.
Line the bottom of a springform pan (26 cm Ø) with baking paper. Fill in the dough and smooth it down. Cover with the plums and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 50-60 minutes.
For the meringue, beat the egg white and lemon juice with the whisk of the hand mixer until stiff, add 160 g sugar and 1 packet of vanillin sugar bit by bit and mix until a creamy mixture is formed.
Pour the meringue mixture into a piping bag with a star-shaped spout, squirt it onto the cake 15 minutes before the end of the baking time and bake to finish. Let the cake cool down and serve.