Prepare the Pudding Cream: In a saucepan, whisk together the egg yolk, cornstarch, sugar, and vanilla extract. Gradually add 150 ml of milk while whisking continuously to create a smooth mixture. Heat the mixture over medium heat, stirring constantly until it begins to thicken. Once thickened, remove from heat and set aside to cool. In a separate bowl, whisk the egg white until stiff peaks form. Gently fold the whipped egg white into the cooled pudding mixture, ensuring it’s evenly incorporated. Set aside.

Prepare the Cake: Preheat the oven to 180°C (350°F). Grease and flour a cake pan. In a mixing bowl, beat the 3 eggs with sugar and a pinch of salt until the mixture becomes light and fluffy. Gently fold in the pudding cream mixture. Mix well until smooth. Pour the batter into the prepared cake pan and bake for 25-30 minutes or until a toothpick inserted comes out clean. Once baked, let the cake cool completely before frosting or serving.

Assemble and Serve: Once the cake has cooled, cut it into slices or serve as a whole. Top with fresh apricot slices or apricot jam for extra flavor.