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 meld together.
Grease a skillet with a little oil and heat over medium heat.
Pour a ladleful of batter into the skillet, spreading it evenly. Cook for 2-3 minutes, until the edges begin 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 skillet as needed.
For the filling, shred or finely slice the cabbage, then sauté it in a pan with a little oil until it begins to soften.
Finely chop the onion and add it to the cabbage. Stir to combine, then sauté over medium heat for 10-15 minutes.
Add a teaspoon of sugar, vinegar, and season with ground black pepper. Stir to combine, then let it cool.
Fill the cooked pancakes with the cabbage mixture, then fold or roll them up.
Serve fresh, optionally topped with sour cream or sprinkled with parsley.
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