Preheat oven to 350°F (180°C) and line a baking sheet with parchment paper.
Separate the eggs. In a bowl, whisk the egg yolks with the sugar and vanilla sugar until pale and fluffy.
In a separate bowl, beat the egg whites with a pinch of salt until stiff peaks form.
Gently fold the egg whites into the yolk mixture until just combined.
Sift in the flour and gently fold until no streaks remain, being careful not to deflate the batter.
Pour the batter onto the prepared baking sheet and spread evenly. Bake for 10-12 minutes, or until lightly golden brown.
Turn the sponge cake out onto a clean kitchen towel and carefully peel off the parchment paper. Roll up the cake with the towel and let it cool completely.
Once the cake is cool, unroll it and spread with strawberry jam. Arrange sliced fresh strawberries evenly over the jam.
Roll the cake back up tightly. Dust the top with powdered sugar. Slice and serve.
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