In a bowl, combine the flour, salt, eggs, milk, and sparkling water. Whisk until the batter is smooth and free of lumps.
Heat a skillet over medium heat, grease it lightly with butter, and cook the pancakes in a thin layer. Set aside to cool.
Finely chop the onion and sauté in a pan with a little oil until translucent.
Add the finely chopped mushrooms and sauté for 5 minutes, or until softened.
Rinse the sauerkraut, squeeze out the excess water, then chop it finely. Add it to the mushroom and onion mixture. Season with black pepper and cumin, and cook for another 5 minutes.
Let the filling cool completely. Divide the filling evenly among the pancakes, place it in the center, and roll up tightly, folding in both ends to create compact cylinders.
Roll the filled pancakes in beaten egg, then in breadcrumbs, making sure they are fully coated.
In a skillet, heat the oil over medium heat. Fry the krokiety until golden brown on all sides, about 3-4 minutes.
Remove the krokiety to a paper towel-lined plate to drain excess oil. Serve warm, for example, with hot broth or sour cream.
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