BBC Food - Recipes - Bombay potato and spinach pie

Ingredients

• 200ml/7fl oz vegetable oil
• 2 onions , sliced
• 450g/1lb potatoes , cubed
• 1 tbsp coriander seeds , toasted in a dry frying pan and ground to a powder
• 1 tbsp cumin seeds, toasted in a dry frying pan and ground to a powder
• 1 tbsp garam masala
• 1 tsp ground ginger
• 2 garlic cloves , crushed
• 3 red chillies , finely chopped
• salt and freshly ground black pepper
• 450g/1lb baby spinach
• 100g/3½oz pistachios
• 270g/9½oz pack filo pastry , cut in 15-20 sheets
• 50g/2oz butter , melted
• 1 tbsp honey
• Greek-style yoghurt
• sesame seeds