
This harissa fish pie gives classic comfort food a warm, smoky North African twist. Tender fish, prawns, peppers, and spinach are baked under a golden sweet potato topping for a hearty seafood dinner with plenty of color and flavor.
Preheat the oven to 180°C/160°C fan/gas 4. Pierce the sweet potatoes all over with a fork, then bake for 50-60 minutes until very soft. For a faster option, microwave them on high for 5-7 minutes, turning halfway. Scoop the flesh from the skins and mash with 2 tbsp rapeseed oil, the cumin, and smoked paprika. Keep warm.
While the sweet potatoes cook, heat the remaining 1 tbsp oil in a large frying pan over medium heat. Add the onion and red pepper and cook for about 7 minutes, stirring often, until softened.
Warm the milk gently in a saucepan over low-medium heat. Add the fish pie mix and defrosted prawns, then simmer for about 4 minutes, just until the prawns turn pink and the fish is barely cooked. Lift the seafood out with a slotted spoon and set aside, reserving the milk.
Stir the harissa paste into the softened onion and pepper and cook for 2 minutes to deepen the flavor. Sprinkle in the cornflour and stir well, then gradually add the reserved warm milk, stirring constantly until smooth and thickened. Stir in the cream and spinach and cook for 2 minutes, until the spinach wilts.
Return the fish and prawns to the sauce and fold them in gently so they stay in large pieces. Taste and adjust the seasoning if needed, depending on the saltiness and heat of your harissa.
Spoon the filling into an ovenproof dish, about 25 x 18 cm. Top with the sweet potato mash, spreading it carefully to cover the filling, then drag a fork across the surface to make ridges.
Bake for 20 minutes until bubbling at the edges. For a crisp, lightly browned top, place under a hot grill for 5-10 minutes, watching closely. Serve hot with steamed green beans.
Use mild or rose harissa for a gentler pie, or add extra harissa if you like more heat. Do not overcook the seafood before baking, as it will finish in the oven. Leftovers can be chilled for up to 2 days and reheated until piping hot; avoid repeated reheating to keep the fish tender.