Place puff pastry slices next to each other on the work surface and allow to defrost. Peel onion and garlic and dice finely. Fry in hot oil. Add minced meat and fry until crispy. Season with salt and pepper.
Remove from the pan. Place the Chinese vegetables in the pan without defrosting them and fry over high heat for 3-5 minutes. Add the minced meat again and stir in the sauce. Separate the egg. Cut an approx. 1 cm wide edge into the puff pastry slices, but do not cut into two opposite corners. Pull the resulting "frame" from the loose corners to the opposite corner, fix with egg white. Spread the chopped vegetable mixture over the nests. Brush the edges with whisked egg yolk. Bake the nests in a preheated oven (electric: 200 °C/ gas: level 3) for about 20 minutes.
Cut an approx. 1 cm wide edge into the puff pastry slices, but do not cut into two opposite corners. Pull the resulting "frame" from the loose corners to the opposite corner, fix with egg white. Spread the chopped vegetable mixture over the nests. Brush the edges with whisked egg yolk. Bake the nests in a preheated oven (electric: 200 °C/ gas: level 3) for about 20 minutes. Sprinkle with coriander leaves as desired