Sift the flour into a large bowl, add the salt, then crack in the egg and gradually pour in the water while mixing. Once the dough comes together, transfer it to a floured surface and knead until smooth, about 8–10 minutes. TIP: If the dough is too dry, add a little water; if it's sticky, sprinkle with a little flour.
Cover the dough with a clean kitchen towel and let it rest for 30 minutes. Resting makes it easier to roll out and prevents the dough from shrinking back during shaping.
Finely chop the onion. Heat the oil in a skillet and sauté the onion until softened, then add the squeezed sauerkraut. Cook together for 10–15 minutes to allow the flavors to meld. TIP: If the sauerkraut is too sour, rinse it under cold water and squeeze it thoroughly.
Roll out the rested dough to about 2 mm thick, then use a glass or round cutter to cut out circles. Place a small spoonful of sauerkraut filling in the center of each circle.
Fold the dough in half to form a half-moon shape and press the edges together with your fingers or a fork to seal. Then set the pierogi aside on a floured surface. TIP: Make sure the filling isn't too hot, otherwise it may soak the dough.
Bring a large pot of salted water to a boil, add the pierogi in batches, and cook until they float to the surface. Once they float, cook for another 1–2 minutes, then drain.
Before serving, sprinkle with fried onions and serve with sour cream. TIP: You can also pan-fry the cooked pierogi in a little oil to give them a crispier texture.
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