Bake chopped walnuts in oven until golden brown. Let them cool until they are room temperature.
Beat cream cheese with condensed milk until you get smooth texture add heavy whipping cream. Beat on high speed until you get 3 times the volume. Make sure not to over beat, otherwise cream turns out runny.
Take ½ of the cream, add cacao powder and beat for few minutes. Until you mix in all cacao well.
Slice you Beskvit cake into 2 layers. Place 1st layer, put white cream, spread ½ of dry plums over the cream. Place Second layer, add cacao cream, spread walnuts. Again, place 3rd layer, put white cream, spread ½ of dry plums over the cream.
Cover all of your cake with cacao cream and cover sides with walnuts and spread walnuts on corners.