In a large bowl, whisk together the flour and salt, then add the eggs.
Gradually pour in the milk and sparkling water, whisking continuously to avoid lumps and create a smooth batter.
Let the batter rest for 15-20 minutes, allowing the ingredients to meld together.
Lightly oil a skillet and heat it over medium heat.
Pour a ladleful of batter into the skillet and spread 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, slice the leek into thin rings and sauté in a pan with a little oil until translucent.
Dice the bacon and fry until crispy in a separate pan.
Combine the sautéed leek, crispy bacon, sour cream, and grated cheese in a bowl. Season with black pepper.
Fill each pancake with the leek and bacon mixture, then fold or roll them up.
Place the filled pancakes in a baking dish and bake at 350°F (180°C) for 10 minutes, allowing the flavors to meld and the cheese to melt slightly.
Serve fresh, garnished with finely chopped parsley.
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