Sri Lankan runner bean curry - Good Food Middle East

Ingredients

• 1 small onion, roughly chopped
• ¼ tsp turmeric
• large piece ginger, peeled and roughly chopped
• 4 garlic cloves
• 2 tbsp vegetable oil
• 2 tsp black mustard seeds
• 5 fresh curry leaves
• 1 tbsp mild curry powder
• 400g can coconut milk
• 4 cloves
• 1 cinnamon stick
• 1 whole dried red chilli
• 300g runner beans, stringed and sliced
• juice 1 lime
• 1 tsp garam masala
• handful fresh coriander
• rice and rotis, to serve (optional)