In a large bowl, whisk together the flour, sugar, salt, and vanilla sugar.
Add the eggs, then gradually pour in the milk and sparkling water, whisking continuously until you have a smooth, lump-free batter.
Let the batter rest for 15-20 minutes to allow the ingredients to fully combine.
Lightly grease a skillet with oil and heat over medium heat.
Pour a ladleful of batter into the skillet and spread it evenly. Cook for 1-2 minutes, until the edges start to pull away from the pan, then flip and cook for another minute.
Repeat the process with the remaining batter, re-oiling the pan as needed.
Fill the cooked pancakes with ground poppy seeds and powdered sugar, then roll or fold them up.
Serve fresh, optionally drizzled with a little honey or jam.
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