Southern Indian vegetable curry with curry leaves

INGREDIENTS

• 2 tablespoons olive oil
• 1 teaspoon mustard seeds
• 2 fresh green chillies, deseeded and chopped
• 1 bunch curry leaves
• 2 onions, peeled and shredded
• ½ teaspoon ground coriander
• 1 pinch ground cumin seeds
• ½ teaspoon garam masala
• ¼ teaspoon turmeric
• ¼ teaspoon chilli powder
• 6 tomatoes, chopped
• 2 sweet potatoes, peeled and cubed
• 2 potatoes, peeled and cubed
• 1 aubergine, cubed
• 100 ml coconut milk
• 1 handful French beans
• 1 handful peas
• 1 handful okra, sliced
• sea salt
• freshly ground black pepper