Cod, turmeric, ginger and coconut curry

Ingredients

• 1 tbsp rapeseed oil
• 1 onion,
• 1 tsp black mustard seeds
• 1 tsp fresh turmeric,
• 2cm fresh ginger,
• 1 large clove garlic,
• 1/4 tsp cayenne pepper
• 1 tsp ground cumin
• 2 tsps garam masala
• 1 x 400ml tin coconut milk
• 2 pieces cod loin
• 200g green beans or frozen peas
• Juice of 1 lime
• Handful fresh coriander
• 1 red chilli,
• To serve
• Basmati rice