Bunny Chow With Sweet Potato & Chickpea Curry

Ingredients

• 4-6 crispy buns
• 1 medium onion, finely chopped
• 2 tbsp olive oil
• 1 tsp ground coriander
• 1 tsp ground cumin
• 2 tsp garam masala
• ½ tsp cayenne pepper
• 2 tsp ground turmeric
• ½ tsp all spice
• 1-inch piece ginger, finely grated
• 3 garlic cloves, sliced
• 3 medium tomatoes, chopped up
• 200ml/¾ cup plus 1 tbsp evaporated coconut milk or coconut cream
• 200ml/¾ cup plus 1 tbsp water
• 1 sweet potato, peeled and diced into small cubes
• 1 x 400g/14 oz can chickpeas, drained
• Salt
• pepper
• Fresh coriander