Make a couple of slashes in both sides of the fish and rub with half the curry paste.

Heat the oil in a roasting tray, then fry the potatoes and onion for about 8 mins until starting to brown.

2)Stir the remaining curry paste into the potatoes, then sit the fish on top and roast for 20-25 mins until the fish and potatoes are cooked.

3)Lift the fish onto plates, then place the potatoes back over a high heat.

Add the spinach to the pan and cook for 3-4 mins until completely wilted.

Scoop out and serve with the fish.