Instructions:
1. Preheat the oven to 180°C (356°F).
2. In a bowl, whisk together 2 eggs, sugar, vanilla sugar, and a pinch of salt.
3. Add oil, butter, baking powder, and flour. Mix until you have a smooth dough.
4. Grease a 26 cm cake mold with butter and spread the dough evenly.
5. In a separate bowl, whisk together 1 egg, sugar, cornstarch, lemon peel, and lemon juice.
6. Heat the milk and gradually add it to the egg mixture while whisking.
7. Pour the generous filling over the cake batter in the mold.
8. In a small bowl, combine the egg yolk and milk for decoration, then drizzle over the top.
9. Sprinkle with sugar.
10. Bake for 35-40 minutes until golden brown.
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