500g (1.1 lb) chicken thigh fillets, cut into bite-sized pieces
1 tbsp soy sauce
1 garlic clove, finely grated
¼ tsp ground white pepper
1 tbsp vegetable oil
250g (8.8 oz) swiss brown or button mushrooms, halved
1¼ cups sour cream
1 tbsp miso paste
2 tbsp corn flour (cornstarch) mixed with 1 tbsp water
½ cup finely sliced spring onion (scallions)
1 sheet frozen puff pastry, thawed
2 egg yolks, lightly whisked
sesame seeds (black or white) for sprinkling





