Haddock & leek au gratin with sweetcorn mash

Haddock & leek au gratin with sweetcorn mash

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(2 ratings)


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Cooking time

Prep: 10 mins Cook: 50 mins

Skill level



Serves 2

Leek and spinach are layered up with white fish fillets and cheese sauce then topped with golden mash in this delicious, low-fat oven bake.

Nutrition and extra info

Additional info

  • Freezable
Nutrition info

Nutrition per serving



  • 350g potatoes, quartered
  • 195g can sweetcorn in water
  • 240g bag ready-washed spinach
  • 2 leeks, thickly sliced
  • 300ml skimmed milk, plus 3 tbsp
  • 15g unsalted butter
  • 15g plain flour
  • ½ tsp English mustard
  • 75g mature reduced-fat cheese, grated
  • 2 x 125g fillets of skinless haddock

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  1. Heat oven to 200C/180 fan/gas 6. Boil the potatoes for 15-20 mins until tender, then drain. Reserve 3 tbsp corn and blitz the rest (with its juice) using a hand blender or a food processor until completely smooth, then mash into the potatoes. Cook the spinach following pack instructions – if you have a microwave, choose this method.
  2. Put the leeks in a pan with the 300ml milk and the butter. Cook gently, part-covered, for 8 mins until the leeks are tender. (Keep an eye on things as milk can easily boil over.) Mix the 3 tbsp milk with the flour and mustard, then stir into the leek mixture – keep stirring until thickened. Take off the heat and stir in three-quarters of the cheese.
  3. Squeeze as much liquid as you can from the spinach, then arrange on the base of 2 gratin dishes. Place a fish fillet on top of each, then spoon over the leek & cheese sauce. Top with the sweetcorn mash. Mix the remaining corn and cheese, and scatter on top. Place the dishes on a baking tray and cook for 25 mins until the fish flakes when tested and the top is golden.

Recipe from Good Food magazine, August 2014

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Show comments
missbakergirl's picture
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Absolutely yummy. I added the sweet corn to the leeks & added peas as well. Thumbs up!

catie74's picture

4, 6 and 10 yr old gave this double thumbs up. Happy days

abikinsey's picture

Made this to the recipe for hubby and I, children were most put out, we had to share some out.
All loved it, so will double up and make in 1 bigger dish, rather than individual dishes. Disagree with comments on sweetcorn mash, it was lovely...!

stoner14's picture
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Really tasty. Loved the sweetcorn mash!

sueellis's picture

I've made this a couple of times now, the first time followed it to the letter. We didn't like the sweetcorn mash, it had a funny texture and colour and we didn't feel it added anything to the dish. Second time made a basic white sauce and added cheese then stired it into the leeks which I sauteed in a little butter and just made ordinary mash and felt it was better. Also 2nd time used smoked haddock which was nice.