In a large mixing bowl, combine all-purpose flour and water. Mix until the dough is formed. Knead the dough for about 5-7 minutes until it becomes smooth and elastic. Cover the dough with a damp cloth or plastic wrap (cling film) and let it rest for at least 30 minutes.

In another large bowl, add the ground beef with light soy sauce, dark soy sauce, oyster sauce, Shaoxing wine, Chinese five spice powder, salt, black pepper, and a pinch of sugar.

Set the rested dough on a floured working surface. Divide the dough into small equal pieces, roughly a little smaller than the size of a golf ball. Roll each piece into an oval shape using a rolling pin. Use your hands to form the oval shapes into rectangles that are about 5-6 inches long and 3 inches wide.

Brush all the dough pieces with sesame oil first before adding the filling. (The folding techniques vary. While some people may first fold it into a "giant dumpling" shape and then roll it out flat to a pie shape. Use whatever method is more straightforward for you!)

Place a spoonful of the meat filling in the center of the dough. Spread the filling out to fully cover the rectangle-shaped dough. Cover another piece of rectangle shape dough with green onion pieces. Lay the meat-filled dough piece on top of the green onions-filled piece into a "Cross" shape. Close each end of the dough over to create one final rectangle shape. Pinch and seal the edge of the dough together, ensuring the filling is completely enclosed.

Brush some vegetable oil in a non-stick skillet or pan over medium heat. Place the assembled meat pie in the hot pan, cooking one pie at a time, or leave some space between each pie if you cook a few at the same time. Cook for 3-4 minutes per side until the bottom turns golden brown and crispy. Flip the pie and cook the other side until it is golden brown and crisp as well, about another 3-4 minutes. Remove the meat pie from the skillet and drain the excess oil on a paper towel. (If you prefer to bake them instead of pan fry: You can preheat the oven to 350 F, then place the assembled meat pies on a baking sheet lined with parchment paper. Bake for about 15-20 minutes or until the pies are cooked and golden brown.

Serve and enjoy your delicious homemade Chinese meat pies!