Separate the eggs, stir the egg yolks with water, 50 g sugar and vanilla sugar until frothy. Beat the egg whites with the rest of the sugar until stiff and fold a third of them into the egg yolk mixture. Then fold in the remaining egg whites, flour and almonds and bake in a springform pan (26 cm) for about 10 minutes in the oven preheated to 175 ° C. Let cool down.
Mix the sour cream and yoghurt with the sauce powder and spread on the base. Spread the washed and cleaned strawberries on top and cover with cake icing.