Thai green prawn curry

Name: Thai green prawn curry
Ingredients: 2 tbsp oil; 1 onion, finely sliced; 6 garlic cloves, crushed; 4cm/1½in piece of fresh ginger, crushed; 2 hot green chillies, seeds removed, finely chopped; ½ tsp ground turmeric; 450ml/14fl oz can coconut milk; 4 green cardamom pods, lightly crushed; 4 cloves; 5-6 curry leaves (available from Asian grocers); 2cm/¾in piece cinnamon stick; 2 tbsp chopped fresh coriander; 500g/1lb 2oz tiger prawns, cleaned and de-veined, shells removed but tail intact