In a large mixing bowl, combine 2 cups of all-purpose flour with ½ cup of hot water and ¼ cup of cold water. Stir with a wooden spoon until a shaggy dough forms. Turn the dough onto a lightly floured surface and knead it for about 10 minutes until it becomes smooth and elastic. Cover the dough with a damp cloth and let it rest for 30 minutes to relax.

In a mixing bowl, combine 1 pound of ground beef or pork, ¼ cup of chopped green onions, 1 tablespoon of minced ginger, and 2 tablespoons of soy sauce. Mix the ingredients thoroughly until well incorporated.

Divide the dough into 10 equal pieces. Roll each piece into a thin round, approximately 4-5 inches in diameter. Place a generous tablespoon of the meat mixture in the center of each round. Fold the dough over to form a half-moon shape and seal the edges tightly to avoid air pockets.

Heat about ¼ cup of vegetable or peanut oil over medium heat in a large skillet. Once hot, carefully place the meat pies into the skillet. Fry each pie for 3-4 minutes on one side until golden brown. Flip the pies and fry for another 3-4 minutes until the other side is also crisp and golden.

Transfer the fried pies to a plate lined with paper towels to drain excess oil. Serve them warm with black vinegar or soy sauce for dipping.