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For the Puff Pastry Dough:
2 1/2 cups (310g) all-purpose flour
1/2 tsp salt
1 cup (226g) cold, unsalted butter, cubed
1/2 cup (120 ml) ice-cold water
1 egg yolk, beaten with 1 tbsp water (for egg wash)
Step 1: Prepare the Beef Filling
Heat the Oil
In a large skillet, heat the vegetable oil over medium heat. Once the oil is hot, add the finely chopped onions and cook until translucent, about 3-4 minutes. Add the minced garlic and ginger, and sauté for an additional 1-2 minutes, until fragrant.
Add the Ground Beef
Add the ground beef to the skillet and cook until browned, breaking it up with a spatula as it cooks. If you prefer a more traditional texture, use finely diced beef instead, cooking until the pieces are tender.
Season the Filling
Stir in the soy sauce, oyster sauce, hoisin sauce, sesame oil, black pepper, and Chinese five-spice powder. Let the mixture cook for 5 minutes, allowing the flavors to meld together.
Thicken the Filling
Dissolve the cornstarch in 1/4 cup water, then pour it into the beef mixture. Stir constantly for 1-2 minutes, until the filling thickens and becomes slightly glossy. Remove from heat, stir in the green onions, and let the mixture cool to room temperature.
Step 2: Make the Puff Pastry Dough
While you can use store-bought puff pastry, making it from scratch adds an extra layer of authenticity and flakiness. If using store-bought, skip to Step 4.
