Creamy Smoky Fish and Spinach Gratin

This was absolutely delicious, one of the best recipes from my cuttings box. It was also very easy to mix and used up the mashed potato I had languishing in the freezer. 

Creamy Smoky Fish and Spinach Gratin (from The Times)

(Serves 4)

1 tsp oil, plus extra to oil the dish
1 small onion, diced
sprig of thyme
salt and pepper
half glass of wine
200g spinach or chard leaves, roughly chopped
500g cooked potatoes, mashed, or in crumbled pieces (if roasted or boiled)
150ml cream or crème fraîche
few gratings of nutmeg
200-300g smoked fish, such as mackerel, kippers, haddock or pollock, broken into large flakes

For the topping
40g breadcrumbs
40g cheddar, parmesan or emmental, grated

Preheat the oven to 200C. Lightly oil an ovenproof dish, about 28cm in diameter.

Heat the oil in a medium-large saucepan over a medium-low heat. Add the onion and thyme, and a pinch of salt and sauté gently, until the onion is softened, for about 15 mins.

Pour in the wine and bring to a simmer. Add the spinach or chard leaves, put the lid on and cook for 1-2 mins, until just wilted.

Remove from the heat and add the potatoes and cream or crème fraîche. Stir to combine and season with nutmeg, salt and pepper.

Gently fold through the fish. Tip the fish mixture into the oven dish. Toss together the breadcrumbs and cheese and sprinkle over the top. Bake for 25 mins until golden and bubbling.

Leave to cool for a few mins before serving with a green salad.