Stir-fry char Siu, mushrooms, onions and yellow chives in a heated pan with oil. Stir in seasoning mix and cook until sauce thickens. Set aside to cool then, divide into 18 portions.
Divide each puff pastry into 9 portions. Place filling into a pastry portion and wrap to make a triangle. Glaze each pastry with egg wash.
Bake the puffs in a preheated oven at 220°C for 10 mins until golden brown.