Mix the ingredients for the dough and bake at 180 C or gas mark 3 for about 25 minutes until golden. Then take it out and let it cool down.
Then distribute the plum jam evenly on the dough.
Mix the whipped cream with the sour cream and the cream stiffener, as well as the vanilla sugar. Then spread this mixture over the plum jam and smooth it out. Garnish with a chocolate garnish or use it to divide individual pieces.