In a large bowl, whisk together the flour and salt, then add the eggs.
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 combine properly.
Lightly grease a skillet with oil and heat over medium heat.
Pour a ladleful of batter into the skillet, spreading it evenly. Cook for 2-3 minutes, or until the edges start to lift from the pan, then flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, re-oiling the skillet as needed.
For the filling, drain the canned tuna and flake it in a bowl with a fork.
Add the finely chopped capers, sour cream, lemon juice, and ground black pepper, then mix well.
Fill the prepared pancakes with the tuna and caper mixture, then fold or roll them up.
Serve fresh, sprinkled with chopped parsley.
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