Green coconut fish curry

INGREDIENTS

• 2 tbsp vegetable oil
• ½ tsp brown mustard seeds
• 4 cloves
• 6 green cardamom
• 1 large piece cinnamon
• 1 small onion
• 5cm/2in piece fresh ginger
• 2 large garlic
• 1 tsp ground coriander
• 300ml/10½fl oz coconut milk
• 2-4 green chillies
• , to taste salt
• 100ml/3½fl oz water
• 10 curry leaves
• ½-1 tsp freshly ground black pepper
• ¾ tsp garam masala
• 500g/1lb 2oz salmonwhite fish
• 2-3 tsp lemon juice
• 50g/2oz fresh coriander