In a large bowl, combine the flour and salt. Make a well in the center.
Beat the eggs with the water and vegetable oil, then pour into the well.
Mix until a dough forms. Knead on a lightly floured surface until smooth and elastic, about 5-7 minutes.
Cover the dough with a damp cloth and let it rest for 30 minutes.
In a bowl, combine the ground beef, ground pork, chopped onion, parsley, black pepper, salt, and garlic powder (if using). Mix until well combined.
Divide the dough into two portions. Roll out one portion on a lightly floured surface to about 1/8-inch thickness.
Use a round cutter (about 2 inches in diameter) to cut circles from the dough.
Place a small spoonful of filling in the center of each dough circle.
Fold the dough over the filling to form a half-moon shape, pinching the edges together to seal. Press the edges with a fork or pinching with your fingers to ensure they are well-sealed.
Bring a large pot of salted water to a boil. Add the pelmeni in batches, making sure not to overcrowd the pot.
Cook for about 5-7 minutes, or until the pelmeni float to the surface and are cooked through. Remove with a slotted spoon.
Enjoy your meal!