Masala chicken pie - Good Food Middle East

Ingredients

• 2 tbsp vegetable oil
• 4 skinless chicken breasts
• 2 onions, chopped
• finger-length piece ginger, grated
• 3 garlic cloves, crushed
• 2 tbsp medium curry powder
• 2 tsp ground coriander
• 2 tsp ground cumin
• 2 tsp black or brown mustard seeds
• 2 tsp white or red wine vinegar
• 2 tsp sugar (white or brown)
• 2 x 400g cans chopped tomatoes
• 150ml light coconut milk (buy a 400ml can- you'll need more for the topping)
• 1 large red pepper, deseeded and cut into large chunks
• 1 large green pepper, deseeded and cut into large chunks
• ½ a small bunch coriander, leaves roughly chopped, stalks reserved (see below)
• 1½ kg floury potatoes, cut into very large chunks
• 150ml light coconut milk
• 1 tsp turmeric
• juice 1 lemon
• 1 bunch spring onions, finely chopped
• stalks from ½ a small bunch coriander, finely chopped
• 1 tsp kalonji seeds (also known as nigella or onion seeds )
• naan bread, to serve (optional)