Thai chicken curry pies

Ingredients

• 2 tablespoons peanut oil
• 1 brown onion, sliced thinly
• 1 clove garlic, crushed
• 10 centimetre stick fresh lemon grass, chopped finely
• 2 centimetre piece fresh ginger, grated
• 600 grams chicken thigh fillets, cut into 3cm pieces
• 1 teaspoon ground cumin
• 1/2 teaspoon ground turmeric
• 165 millilitres can coconut milk
• 1 tablespoon cornflour
• 1/4 cup chicken stock
• 1 tablespoon fish sauce
• 1 fresh kaffir lime leaf, shredded finely
• 1 fresh long red chilli, sliced thinly
• 1/4 cup coarsely chopped fresh coriander
• 2 sheets shortcrust pastry
• 1 egg, beaten lightly
• 2 sheets puff pastry