Mix flour, baking soda and salt in a bowl. Cream butter, brown and white sugar with the whisk of the hand mixer. Stir in the eggs one after the other on the lowest setting. Add vanilla extract and lemon zest. Alternately stir in flour mixture and 5 tbsp. cream. Put the dough into a greased springform pan (20 cm ∅), dust with flour and smooth it down
Simmer the raspberry jelly in a pot while stirring for 3-5 minutes. Then stir in the plums and add the fruit mass to the dough
Bake the cake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) on the middle shelf for approx. 30 minutes until the cake is golden brown. Cover the cake with aluminium foil and continue baking for approx. 30 minutes (stick test), remove and allow to cool
Whip 150 g cream and egg liqueur. Dust the cake with icing sugar and add the advocaat cream
Preparation time approx. 1 hour 40 minutes. waiting time approx. 2 hours