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Friday, 6 February 2026

Cod (white fish) Gratin


Does Friday mean fish in your house? For many it does, and as it's Friday I'm sharing this Gratin recipe which uses fish! In fact although the recipe below states cod you can use any white fish in this recipe, and you can flex your chef muscles over the béarnaise sauce! There's some whisking to do!

Ingredients
Serves Four

2 leeks, sliced
2 carrots, sliced
1 onion, chopped
40g/1½oz butter, plus extra for greasing
600g/1lb 5oz cod loin, skinned and cut into 3cm/1in chunks
2 tbsp plain flour
50ml/2fl oz dry white wine
salt and freshly ground black pepper

For the béarnaise sauce
70ml/2½fl oz white wine vinegar
2 shallots, finely chopped
2 sprigs fresh tarragon, plus 1 tsp freshly chopped
1 bay leaf
6 peppercorns
4 (free-range) egg yolks
300g/10½oz unsalted butter

Method
1. Gently fry the leeks, carrots and onion in the butter until softened and starting to caramelise. Add the cod and flour and stir over the heat for a minute or two. Stir in the wine and cook for another minute to allow the sauce to thicken a little. Season with salt and pepper
2. For the béarnaise sauce, gently heat the vinegar in a saucepan. Add the shallots, tarragon sprigs, bay leaf and peppercorns. Heat gently over a medium heat until the volume of liquid has reduced by at least half. Strain and set aside until cooled.
3. Meanwhile, preheat the oven to 180C/160C Fan/Gas 4 and butter a shallow ovenproof dish.
4. Beat the egg yolks with a teaspoon of water. Stir the mixture into the strained, cooled vinegar and pour into a heatproof bowl set over a pan of simmering water. Whisk constantly until the sauce has increased in volume and is thick enough to coat the back of a spoon.
5. Melt the unsalted butter in a saucepan. Remove the bowl from the heat and slowly pour in the melted butter in a steady stream, whisking continuously, until the mixture has thickened and is smooth. Fold in the chopped tarragon and season to taste with salt and pepper.
6. Spoon the cod and vegetable mixture into the ovenproof dish. Pour over the béarnaise sauce and bake for 15-20 minutes.
7. Sit and enjoy this tasty dish 😋

From an idea seen here


~ enjoy your day ~

You will find a variety of recipe ideas and articles within this blog. Please note, not all may be suitable for you. Always take account of your personal circumstances, needs, illnesses and medication you may be taking. If you may have any food allergies, or underlying health issues these must always be taken into account. If you are a diabetic and not sure how certain foods may affect your blood sugars, test is best, i.e. use your meter. If you have any concerns about your health, it is always advisable to consult your doctor or health care team.

All the best Jan

33 comments:

Anonymous said...

Looks delicious -Christine cmlk79.blogspot.com

Anonymous said...

Looks tasty Jan.

Tina

Mari said...

I rarely make fish because I don't have great recipes or dry it out. This looks like a good one though and I think my hubby would like it.

J.P. Alexander said...

Gracias por la receta. Te mando un beso

Tom said...

...I like fish, but I rarely eat it.

DeniseinVA said...

Thank you Jan, it looks fantastic. All the best, Denise

Debbie said...

looks and sound, so very good!!

Angie's Recipes said...

Looks so tasty!

Granny Marigold said...

I love that cheery little bouquet of flowers! Unfortunately we're not fond of fish; well, maybe salmon ...and that's so expensive.

Stefania said...

A casa di mia nonna il venerdì era sempre il giorno del pesce e lei preparava sempre il "merluzzo in umido".
Noi non siamo grandi amanti del pesce e lo mangiamo una volta ogni tanto, senza giorno fisso

Margaret D said...

Looks good Jan. I often make a smoked cod dish in winter.

♥ Łucja-Maria ♥ said...

Dear Jan!
This fish dish looks very appetizing. Cod is the only fish I love.
Have a nice Friday :)

Ananka said...

Looks very healthy :-D

eileeninmd said...

Hello Jan,
Looks like a delicious meal, thanks for sharing!
Have a great day and a happy weekend.

Shari Burke said...

Bill loves white fish. I find it meh, but I think I'd love this so will give it a try!

My name is Erika. said...

I don't think I've ever had fish this way. Usually it's just a "slice" of cod. I bet it's yummy and flavorful. Happy almost weekend to you.

Bijoux said...

That looks amazing, as always!

jabblog said...

We eat a lot of fish and this recipe looks very tasty.

Joyful in His Presence said...

I always enjoy it when you post a recipe for fish of any kind. We love fish, but I'm not really very creative when it comes to ways to prepare it. And I also appreciate the flower pictures you've been sharing. We are having snow today...part of a winter storm that is passing through this weekend.

Victor S E Moubarak said...

Cod is a favourite here.
God bless.

Elkes Lebensglück said...

Delicious fish dish, I've never cooked it like that before!
Have a nice evening!hugs Elke

Rustic Pumpkin said...

a friend once something similar but with a layer of sliced tomatoes in the bottom of the dish. his recipe also called for a generous pinch of mixed herbs or Italian seasoning. Inadvertently his wife passed him the dried nettle tea! turned out to be a serendipitous mistake. I'm not a huge fan of whitefish but I think the sauce makes more interesting

Mary Kirkland said...

That sounds really good.

https://linsartyblobs.blogspot.com said...

It looks tasty.

Chatty Crone said...

Looks good. :)

HappyK said...

Looks quite tasty!!

DVArtist said...

We eat a lot of cod here. This looks so good.

Linda's Relaxing Lair said...

Dear Jan, I love ❤️ Cod. Thank you for sharing this.

Conniecrafter said...

going to have to pass on this one, not fond of fish :(

Carla from The River said...

Yum! Thank you!!

gluten Free A_Z Blog said...

I make fish when I have company and am always looking for more recipes. Thanks this one is perfect Jan.

Back2OurSmallCorner said...

This fish gratin looks delicious and I would have it any day of the week, not just Friday.

Teresa said...

Me gusta mucho el pescado, ayer comí merluza. Besos.