Wash and clean the rhubarb and cut into 1 cm thick slices. Coarsely grate the marzipan. Cream soft fat, sugar, vanillin sugar, bitter almond flavour and salt. Add marzipan and stir well.
Stir in the eggs one after the other. Mix flour, starch and baking powder and finally fold in briefly. Stir in 70 g amaretti and rhubarb and fill the dough into a greased, flour-dusted ring cake tin (2.3 litres capacity).
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 50 minutes. Leave to rest in the pan for 10 minutes and then turn out onto a grid. Let cool off. Mix icing sugar and lemon juice.
Dye pink with food colouring and place on the cake. Decorate with remaining amaretti and sugar pearls. Whipped cream tastes good with it.