Sift the all-purpose flour into a large bowl, add the salt, then crack in the egg. Gradually add the water while mixing. Once the dough comes together, place it on a lightly floured surface and knead until smooth, about 8-10 minutes. TIP: The dough is ready when it's elastic, soft, and doesn't stick to your hands.
Cover the dough with a clean kitchen towel and let it rest for 30 minutes at room temperature. This will make it easier to roll out.
Blanch the spinach in boiling water for 1-2 minutes, then drain well and chop. Chop the onion and sauté in oil in a pan until translucent, then add the spinach and mix. Let it cool, then crumble in the feta cheese and mix until creamy. TIP: Don't overcook the spinach, as it will lose its vibrant color and flavor.
Roll out the rested dough to about 2 mm thickness. Cut out circles with a glass, and place a teaspoon of the spinach and feta filling in the center of each.
Fold the circles in half and press the edges together with your finger or a fork. TIP: If the edges of the dough don't stick well, moisten them with a little water.
Bring a large pot of water to a boil, and salt lightly. Cook the pierogi in batches for 3-4 minutes, until they float to the surface. Then cook for another 1-2 minutes, then drain.
Serve with sour cream and fried onions. TIP: You can also fry the cooked pierogi in a little oil until golden brown if you want a crispier experience.
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