Sift the all-purpose flour into a large bowl, add the salt, then the egg, and gradually add the water while mixing. Once combined, transfer the dough to a lightly floured surface and knead for 8–10 minutes until smooth and elastic. TIP: The dough should be soft, but not sticky.
Cover the dough with a clean kitchen towel and let it rest at room temperature for 30 minutes. This will improve its elasticity and make it easier to shape.
Peel and chop the potatoes, then boil them in salted water until tender, about 15 minutes. Drain and mash until smooth. Let it cool.
Finely chop the onion. Heat the sunflower oil in a skillet over medium heat, and sauté the onion until golden brown. Mix the caramelized onion into the mashed potatoes. Season with salt to taste. TIP: The sweetness of the onion perfectly balances the simplicity of the potatoes.
Roll out the rested dough to a thickness of about 2 mm. Using a glass or cookie cutter, cut out circles, and place a spoonful of potato filling in the center of each.
Fold the circles in half to form a half-moon shape, then firmly press the edges together with your fingers or a fork to seal. TIP: If the dough is dry, slightly moisten the edges with water to help them stick together.
Bring a large pot of salted water to a boil. Cook the pierogi in batches for 3–4 minutes, until they float to the surface. Cook for another 1–2 minutes.
Remove the pierogi with a slotted spoon and serve hot with sour cream and the remaining fried onions. TIP: You can also pan-fry the cooked pierogi in a little oil for a crispier texture, if desired.
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