Put the sugar, flour and a bit of salt in a deep pan and slowly add the hot milk while stirring. Next, add the egg yolks, slightly beaten. Boil the pudding over low heat until it thickens. As soon as you remove it from heat, add the vanilla powder and let it cool, stirring from time to time to prevent a skin from forming on the surface. Add the whipped cream and stir the cold pudding softly. Then, pour the mixture over the cold, syrupped cake. Sprinkle with cinnamon and roughly ground walnuts. Place the spatoula in the fridge for a few hours until it gets cold and the pudding stiffens.