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 frying pan with oil and heat over medium heat.
Pour a ladleful of batter into the pan and spread it evenly. Cook for 2-3 minutes, until the edges start to pull away from the pan, then flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, re-oiling the pan as needed.
Flake the smoked mackerel into smaller pieces, making sure to remove any bones.
Finely chop the red onion and garlic, then sauté in a little oil in a pan until translucent.
Add the mackerel and cook over medium heat for 2-3 minutes, allowing the flavors to meld.
Stir in the sour cream, capers, and lemon juice, then cook for another 2 minutes.
Fill the pancakes with the smoked mackerel mixture, then fold or roll them up.
Serve fresh, sprinkled with chopped dill and freshly ground black pepper.
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