CURRIED PRAWN & GREEN BEAN PIE

Steps:

• Heat 2 tbsp of the oil in a medium saucepan. Add the onion and a pinch of salt and fry over a medium heat for 8 mins, or until the onions turn golden and sticky. Stir the flour and curry paste into the onions and cook for 2 mins. Remove from the heat and quickly whisk through the milk in several additions to make a thick sauce.
• Bring a large pan of water to the boil, add the beans and cook for 1 min, then scoop out with a slotted spoon and set aside. Add the potatoes to the water and cook for 5-6 mins or until you can easily insert a cutlery knife into them. Drain and mash. Stir through the remaining oil, turmeric and nigella seeds, then season to taste.
• Add the prawns and green beans to the sauce. Bring to a simmer and quickly remove from the heat. Stir through the coriander and crème fraîche and season to taste.
• Heat the grill to its highest setting. Spoon the mixture into a medium heatproof dish. Spread over the mashed potato and grill for 4-5 mins or until golden and bubbling.