01 - Combine ground pork, onion, garlic, soy sauce, oyster sauce, sugar, black pepper, salt, cornstarch, and sesame oil in a mixing bowl. Mix thoroughly until well incorporated.
02 - Preheat oven to 400°F. Line a baking tray with parchment paper.
03 - On a lightly floured surface, roll out puff pastry sheets to about 1/8 inch thickness. Cut into 10 circles (about 3.5 inches in diameter).
04 - Place 2 tablespoons of meat filling in the center of 5 pastry circles.
05 - Brush the edge of each filled circle with beaten egg. Cover with a second pastry circle, pressing the edges to seal. Crimp edges with a fork for a decorative touch.
06 - Brush tops with remaining beaten egg for a golden finish.
07 - Arrange pastries on the prepared baking tray, leaving space between each.
08 - Bake for 20-25 minutes, or until pastries are puffed and golden brown.
09 - Let cool slightly before serving warm.