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Home » Recipes » Fish

Creamy Gratin of Smoked Haddock, Tomatoes and Potatoes

Published: Mar 16, 2022 · Modified: Mar 20, 2026 by Deborah · This post may contain affiliate links · This blog generates income via ads · #sponsoredpost · Leave a Comment

Creamy gratin of smoked haddock, tomatoes and potatoes grey bowl with fork beside oval casserole dish
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This creamy gratin of smoked haddock, tomatoes and potatoes recipe is from Diana Henry's From the Oven to the Table recipe book.   David gave me a set of 3 of her books for Christmas...there's so many delicious recipes to make!!

I love fish, smoked haddock in particular, so this was always going to be on the list to get made from this recipe book!   It's 'almost' a one pan dish that's baked in the oven.  You do need to heat the cream and garlic in a saucepan!

The end result is a delicious full of smoked fish flavour dish, that's very comforting.   It is quite rich, but the fresh tomatoes help to balance it out.  Enjoy with some green veg and crusty bread on the side to soak up the creamy sauce!

Tip

  • This creamy gratin of smoked haddock, tomatoes and potatoes recipe is easily adapted if you're cooking for less or more people.

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How to make this Creamy Gratin of Smoked Haddock, Tomatoes and Potatoes

Ingredients

  • 500g smoked haddock fillets, skinned
  • 400g tomatoes
  • 700g waxy new potatoes, unpeeled, such as Charlotte
  • salt and freshly ground black pepper
  • leaves from 6 thyme sprigs
  • 500ml double cream (I use Elmlea to reduce the calories!)
  • 1 clove garlic, sliced
  • 1 to 2 tsp English mustard, to taste
  • 40g extra mature cheddar cheese, grated
  • 15g parmesan cheese, grated

Instructions

  1. Preheat the oven to 210C/190C fan/gas 6. Put a metal baking tray in the oven to heat up.
  2. Cut the fish into slices about 4cm thick.
  3. Slice the tomatoes finely. You don't need to save the juice, so leave whatever runs out on to the chopping board, as the slices shouldn't be too wet. Scrub then slice the potatoes finely, using a mandolin if you have one. It's important that the slices are really wafer thin or the potatoes won't cook through in the time given and you'll have to cook the gratin for longer, which means the fish will be overcooked.
  4. Layer up half the potatoes and half the tomatoes in a metal gratin dish about 30cm in diameter, or an oval shaped dish or casserole measuring around 36 x 23cm, with a capacity of at least 2 litres, seasoning and sprinkling on the thyme as you do so.
  5. Heat the cream and garlic in a saucepan to boiling, then strain it into a bowl and stir in the mustard, to taste. Pour half of the cream mixture over the vegetables.
  6. Lay the fish on the cream soaked vegetables, then add the rest of the vegetables and pour over the remaining hot cream. Sprinkle both cheeses on top.
  7. Bake in the oven on the hot baking tray for 45 to 50 minutes, or until the potatoes are tender. Remove from the oven and leave to settle for 10 minutes, then serve. It's delicious with some crusty bread on the side to soak up the creamy sauce!

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Creamy gratin of smoked haddock, tomatoes and potatoes grey bowl with fork beside oval casserole dish

Creamy Gratin of Smoked Haddock, Tomatoes and Potatoes

By: Deborah
A delicious full of smoked fish flavour dish, that's very comforting.
PREP: 25 minutes mins
COOK: 1 hour hr
TOTAL: 1 hour hr 25 minutes mins
Servings: 4 people
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Equipment

  • Baking tray
  • Deep casserole dish

Ingredients

  • 500 g (1.1 lb) smoked haddock fillets skinned
  • 400 g (2 ¾ cups) tomatoes
  • 700 g (1.5 lb) waxy new potatoes unpeeled, such as Charlotte
  • salt and freshly ground black pepper
  • leaves from 6 thyme sprigs
  • 500 ml (2 ¼ cups) double cream (I use Elmlea to reduce the calories!)
  • 1 clove garlic sliced
  • 1 to 2 tsp English mustard to taste
  • 40 g (⅓ cups) extra mature cheddar cheese grated
  • 15 g (3 tbsp) parmesan cheese grated

Instructions

  • Preheat the oven to 210C/190C fan/gas 6. Put a metal baking tray in the oven to heat up.
  • Cut the fish into slices about 4cm thick.
  • Slice the tomatoes finely. You don't need to save the juice, so leave whatever runs out on to the chopping board, as the slices shouldn't be too wet. Scrub then slice the potatoes finely, using a mandolin if you have one. It's important that the slices are really wafer thin or the potatoes won't cook through in the time given and you'll have to cook the gratin for longer, which means the fish will be overcooked.
  • Layer up half the potatoes and half the tomatoes in a metal gratin dish about 30cm in diameter, or an oval shaped dish or casserole measuring around 36 x 23cm, with a capacity of at least 2 litres, seasoning and sprinkling on the thyme as you do so.
  • Heat the cream and garlic in a saucepan to boiling, then strain it into a bowl and stir in the mustard, to taste. Pour half of the cream mixture over the vegetables.
  • Lay the fish on the cream soaked vegetables, then add the rest of the vegetables and pour over the remaining hot cream. Sprinkle both cheeses on top.
  • Bake in the oven on the hot baking tray for 45 to 50 minutes, or until the potatoes are tender. Remove from the oven and leave to settle for 10 minutes, then serve. It's delicious with some crusty bread on the side to soak up the creamy sauce!

Notes

  • This creamy gratin of smoked haddock, tomatoes and potatoes recipe is easily adapted if you're cooking for less or more people.

 

You might also like to try:
  • fish dishes

Nutrition

Calories: 774kcal | Carbohydrates: 36g | Protein: 43g | Fat: 52g | Saturated Fat: 32g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 13g | Cholesterol: 251mg | Sodium: 1266mg | Potassium: 1695mg | Fiber: 4g | Sugar: 9g | Vitamin A: 2995IU | Vitamin C: 32mg | Calcium: 294mg | Iron: 4mg

Nutrition information is automatically calculated, so should only be used as an approximation.

KEYWORDS Diana Henry, From the Oven to the Table, gratin recipe, oven baked, smoked fish gratin
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Deborah sitting at the breakfast bar in their kitchen with a green Head Chef mug.

Hello!   I'm Deborah and I'm married to David and have 2 lovely step sons and the most beautiful fox red labrador retriever called Ritchie, who we took home at the end of May 2020 as an 8 week old puppy.   David and I both love cooking…for ourselves, family and friends.   I’m definitely one of the lucky ones…getting cooked for and we enjoy cooking together.

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