Soak the raisins in rum for at least 30 minutes to soften and absorb the rich flavor.
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.
Drain the raisins, gently fold them into the pancake batter, then add the remaining rum to enhance the flavors.
Let the batter rest for 15-20 minutes to allow the ingredients to meld together.
Grease a skillet with a little 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 1 minute.
Repeat the process with the remaining batter, re-oiling the skillet occasionally.
Stack the finished pancakes on a plate and sprinkle with powdered sugar or serve with cinnamon sugar, if desired.
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