Creamy Smoked Haddock Gratin with Leeks and Potatoes

Prep
15 minutes
Cook
25 minutes
Serves
4
Course
Main Course
Cuisine
British

Ingredients

  • 500g smoked haddock fillet (undyed), skinless and boneless

  • 500g waxy potatoes, thinly sliced

  • 1 leek, cleaned and sliced

  • 1 onion, finely chopped

  • 2 cloves garlic, minced

  • 300ml whole milk

  • 150ml double cream

  • 25g butter

  • 25g plain flour

  • 1 teaspoon Dijon mustard

  • 50g mature cheddar cheese, grated

  • Salt and freshly ground black pepper

  • Fresh parsley, chopped (for garnish)

Method

  1. Preheat oven to 200°C (400°F). Grease a medium-sized ovenproof baking dish.

  2. Gently poach the smoked haddock in the milk in a saucepan over low heat for 5–7 minutes. Remove fish with a slotted spoon; reserve the milk.

  3. In another pan, melt butter. Sauté onion, garlic, and leek until soft.

  4. Stir in flour to form a roux. Gradually add the reserved milk and cream, whisking until smooth.

  5. Add mustard and cheddar cheese. Stir until cheese melts and sauce thickens. Season to taste.

  6. Layer half the potatoes in the baking dish, then flaked haddock, sautéed leek mixture, and remaining potatoes.

  7. Pour cheese sauce evenly over the top.

  8. Cover with foil and bake for 25 minutes. Uncover and bake another 10–15 minutes until golden and bubbling.

  9. Garnish with chopped parsley and serve hot.

Nutrition per serving

  • Calories480
  • Fat28g
  • Saturated Fat14g
  • Cholesterol85mg
  • Sodium620mg
  • Carbs28g
  • Protein30g
  • Sugar4g
  • Fiber3g

Nutrition is an estimate.

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Tips for Smoked Haddock Gratin

  1. Use undyed smoked haddock for better flavour and appearance.

  2. Don’t overcook the haddock during poaching — 5–7 minutes is enough.

  3. Use the poaching milk to enrich the sauce — it’s full of flavour.

  4. Waxy potatoes hold their shape best.

  5. Slice potatoes thinly for even baking.

  6. Taste your sauce before assembling — balance salt carefully.

  7. Add mustard for a subtle sharpness.

  8. Let the gratin rest for 5–10 minutes before serving.

  9. For a crispy top, add breadcrumbs before baking uncovered.

  10. Store leftovers in an airtight container for up to 3 days.

Serve It With Suggestions

  • Steamed green beans

  • Crisp garden salad with lemon vinaigrette

  • Buttered peas

  • Pickled beetroot or red cabbage

  • Crusty bread

  • Dill and lemon wedges

  • Light dry white wine

  • Roasted carrots or parsnips

  • Grain mustard on the side

  • A poached egg for a brunch-style twist

FAQs

Q: Can I use frozen smoked haddock?
A: Yes — defrost thoroughly and pat dry before poaching.

Q: Can I make it ahead?
A: Yes — assemble ahead and refrigerate. Bake when ready to serve.

Q: Can I use a lighter cream?
A: Yes — use light cream or half milk, half crème fraîche.

Q: Is it gluten-free?
A: Substitute gluten-free flour for the roux.

Q: Can I freeze it?
A: You can, but the texture of potatoes may change slightly.

Q: What cheese can I use instead of cheddar?
A: Gruyère, Emmental, or even Parmesan work well.

Q: What potatoes work best?
A: Waxy varieties like Charlotte or Yukon Gold.

Q: Can I add vegetables?
A: Yes — try spinach, peas, or thinly sliced courgette.

Q: How long will leftovers last?
A: Up to 3 days in the fridge in a sealed container.

Q: Can I make it without cream?
A: Yes — replace cream with more milk and reduce slightly for thickness.

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