Grate the currant and set aside. Line the baking tray with baking paper. Preheat oven to 180 °C (top and bottom heat).
Sift together flour and cornstarch. Beat eggs, powdered sugar, salt, vanilla sugar and grated lemon peel (at least 10 minutes) until foamy.
Slowly pour in Kronenöl Spezial with fine butter flavor while stirring constantly. Fold in flour mixture and gently add the currants.
Spread mixture on baking paper and bake on middle rack for about 15 minutes. Let cool.
For the snow mixture, whip the egg whites well and gradually add the granulated sugar until you have a creamy consistency. Gently fold in the currant and spread on the base.
Bake the currant mousse in the preheated oven at high top heat at approx. 230 °C for a few minutes.