Mix Dry Ingredients: In a large bowl, combine 2 cups of all-purpose flour and 1/2 teaspoon of salt.
Add Oil and Water: Gradually add 1/4 cup of vegetable oil and 1/2 cup of water to the flour mixture, stirring until the dough comes together. Adjust the water as needed.
Knead the Dough: Knead the dough for about 5 minutes until it becomes smooth and elastic. If it's too dry, add more water, a tablespoon at a time.
Rest the Dough: Cover the dough with a damp cloth and let it rest for 20 minutes.
Cook the Beef: In a large skillet, heat 1 teaspoon of sesame oil over medium-high heat. Add 1 lb of ground beef and cook until browned, breaking it apart with a spoon.
Add Aromatics: Add 2 minced garlic cloves, 1 tablespoon of minced ginger, and 3 chopped scallions to the pan. Cook until fragrant, about 1-2 minutes.
Season the Beef: Stir in 1 tablespoon of soy sauce, 1 tablespoon of oyster sauce, 1 tablespoon of rice vinegar, 1/2 teaspoon of ground black pepper, and 1/2 teaspoon of sugar. Cook for an additional 2-3 minutes.
Cool the Filling: Remove from heat and let the beef mixture cool to room temperature.
Divide the Dough: After resting, divide the dough into 12 equal portions. Roll each into a ball and flatten into a small circle.
Fill the Pies: Place a spoonful of the cooled beef filling in the center of each dough circle. Fold the dough over and pinch the edges to seal.
Shape the Pies: Gently flatten the pies with your hands or a rolling pin to form a round, slightly thick shape.
Heat Oil: In a large frying pan, heat enough vegetable oil for frying over medium-high heat.
Fry the Pies: Fry the pies in batches, turning occasionally, until golden brown and crispy on both sides, approximately 4-5 minutes per side.
Drain Excess Oil: Remove the pies from the oil and place them on a paper towel-lined plate to drain any excess oil.
Serve Hot: Enjoy the crispy pies immediately with your favorite dipping sauce, such as soy sauce or chili oil.