JB’s French Fish Pie

Published30 Mar '26 Updated11 Apr '26

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I always loved eating a traditional French Fish Pie Parmentier de Poisson at Easter. It’s one of those dishes that just feels right for the occasion. Fish pieces are poached in a creamy dill béchamel sauce with leek and fennel, then topped with buttery mashed potato and baked until crispy. Let’s go!

JB’s Fish Pie is one of those dishes that feels special but isn’t fussy to make. It’s got generous pieces of fish nestled in a white wine béchamel sauce that’s flavoured with butter sautéed leeks, fennel and onion, and finished with fresh dill. Nothing shouts on its own (except those crispy golden potato swirls) but the whole is far greater than the parts – properly occasion-worthy (hello, Good Friday). Or just simply tell everyone, “it’s French, darling!”.

PS I don’t want to brag, but I Fish Pie for breakfast – it was for recipe testing! What did you have? 😇

French Fish Pie

Every Friday back home, my mum would head to the village market early to pick up fresh fish – usually pollock – to cook for our family meal. This was a weekly Catholic tradition that we grew up with, so we would have never thought to have anything else on Easter Friday.

I can’t remember exactly what my mother used to make for Easter, but I remember this fish pie made an appearance on the table a few times because it was my favourite.

We call this Fish Pie “Parmentier de Poisson”, named after Monsieur Parmentier, the man who famously helped make potatoes a staple in France. A true hero to my eyes! 😂

It’s a simple pie to make and the things that make it distinctly French is the use of leek, fennel and fresh dill which brings freshness to the creamy white wine béchamel sauce. Just add a crusty baguette and you are good to go!

Ingredients in French Fish Pie

Here is what you need to make my favourite Easter fish pie:

1. FISH FOR THE PIE

The fish pictured throughout this post is ling which works well here. Commonly found in Australia and New Zealand, it is quite lean and firm, so it holds its shape nicely. See below for other suitable fishes for this recipe.

OTHER SUITABLE FISH

Any firm white fish fillets that are at least 2 cm/0.8″ thick will work here. Here are suggestions for common fish that are ideal for using in this recipe:

Australia: Barramundi, Blue eye cod / Trevalla, Basa, Bream, Cod, Flathead, Jewfish, Monkfish / Stargazer, Ocean perch, Snapper.
US: Above and below listed, plus Pollock, Catfish, Halibut, Pangasius, Tilapia.
UK/Europe: Above listed, plus, Pollack, Sea bass.

Salmon and trout will work too, though not traditional.

FISH TO AVOID

I recommend avoiding:

Fish that dry out easily when cooked – Like swordfish, tuna, bonito, kingfish, marlin.
Delicate and thin-filleted fish – Like flounder, sole, plaice. The texture of the flesh is a bit too delicate for this type of cooking and these fish tend to be very thin fillets.
Oily, strong-tasting fish – Like mackerels, mullet and sardines.

2. FISH PIE FILLING + SAUCE

Fennel – Brings a light, slightly sweet anise savour that works well with fish.
Leek – Soft, mild onion flavour that blends nicely into the sauce.
Onion and garlic – Standard flavour bases.
Dry white wine – Gives the sauce depth of flavour. Without, it tastes like it’s missing something. Chardonnay is my favourite for cooking and that was the most commonly used at restaurants I worked at in France, but any other dry white wine will work. There is no need to use an expensive wine here. Can be skipped if non-alcoholic, or use non-alcoholic wine.
Milk and cream – I like to use both to bring a little extra richness into the sauce. You can substitute the cream with more milk, but it will reduce the richness. Lactose-free milk and cream work too.
Fresh dill – Adds freshness and lifts the whole dish. Key ingredient here that complements the fish perfectly.
Plain flour / all-purpose flour – Thickens the sauce so the filling holds together.
Extra virgin olive oil + butter – I’ve always cooked this using both, as the butter adds flavour while the oil helps prevent it from burning.
Cooking salt / kosher salt – Used for seasoning. If you’ve only got table salt, halve the amount. For salt flakes, increase by 50%.
Black pepper – Cracked black pepper, the one we commonly use in our recipes.

3. MASH POTATO TOPPING

Potatoes – Use starchy potatoes rather than waxy for a light and fluffy mash (Sebago in Australia – the dirt covered ones you see on the shelves, Russet in the US, King Edward or Maris Piper in the UK are perfect).
Unsalted butter – Adds richness and flavour. Add it before the milk so it melts into the hot potatoes and is incorporated evenly.
Milk – Full fat preferred for a creamier mash, though low fat works too.
Cooking salt / kosher salt – For seasoning. If you’ve only got table salt, halve the amount. For salt flakes, increase by 50%.
White pepper – Classic in mash, more subtle than black pepper and without the black speckles. You can use black pepper if that’s what you have.

How To Make French Fish Pie

Get the potatoes boiling for the mash first then start preparing the creamy filling with the fish. Then assemble the pie and bake. Once it’s out of the oven, I’ll leave the rest up to you. ☺️

1. FISH PIE FILLING

Season fish – Pat the fish pieces dry with paper towels and sprinkle all sides with salt. Set aside.
Sauté vegetables – Heat oil and butter in a 26cm / 10″ cast-iron skillet over medium-high heat. Add onion, fennel, leek and garlic. Cook 5 minutes until softened. Stirring regularly.
I use an oven proof skillet because you can make the filling in it then bake it in the same vessel. However, if you don’t have one, just bake the pie in a casserole dish.

Make roux – Add flour, stir 30 seconds. Pour in white wine – it will simmer rapidly at first – then mix it in, it will look pasty.
Finish béchamel – Slowly pour in the hot milk and cream while stirring. Add salt and pepper. Bring to a simmer, cook 1 minute until thickened.

The sauce should be quite thick, fully coating the back of the spoon then gently run down it.
Finish filling –Turn the heat off. Stir in dill. Add the fish pieces to the sauce, gently nestling them in so they’re mostly submerged. Then, using a spatula, carefully stir and move them around just enough to coat them in the sauce. Smooth the surface.

2. MASH POTATO TOPPING

Cook potatoes – Place potatoes in a large saucepan, cover with cold water. Bring to a boil, then simmer 25 minutes until very soft.
Rice / Mash – Drain well. Pass through a potato ricer or return to the pot and mash well with a potato masher.

Butter and milk – Add butter first with salt and white pepper, stir until combined. Then add warm milk. Stir until smooth. It should be creamy but not loose (so it holds its shape when pipped).
Piping bag – Transfer into a piping bag fitted with a star tip. Set aside and keep warm. It must be warm to be piped because cold mashed potato is hard.
If you don’t have a piping bag, use a ziplock bag, or spoon dollops over the top spread mash across the surface and rough it up with a fork.

3. PIPING THE POTATO AND BAKING

Pipe mashed potato – Pipe mounds of hot mashed potato swirls across the surface, or whatever style you want. The swirls I did have a 4.5cm base (1.6″), about 4cm tall (1.4″).
Then fill gaps with small swirls/blobs. Make sure to use all the mash! Spray lightly with olive oil.
Bake – Bake 35 minutes, rotating halfway, until golden on top. I highly recommend placing a baking tray lined with foil at the bottom of your oven to catch any bubbling filling that may leak during baking. Easier to clean!
Rest for 10 minutes before serving to cool slightly and let the sauce thicken a bit more.

How To Serve French Fish Pie

To serve, scoop generous portions so you get both the creamy fish and the crispy-creamy potato on plates and serve it with roasted asparagus, a side of roasted broccoli or a simple green beans salad. And of course, some crusty bread – because in France, bread is always on the table.

And that’s a wrap for this one! If you make it, I’d love to hear how it turns out. Wishing you a very happy Easter and enjoy every bite. Bon appétit! – JB

FAQ – French Fish Pie

Watch How to Make it

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This one takes me back to the old HQ again, when we had the (questionable) idea of building a barbecue pit. It was very much a work in progress… and honestly, not looking great at that stage!

Of course, Dozer had to come and inspect. Standing right in the middle of it, as if he oversaw the construction. To be honest I’m not sure he was convinced by my work! 😂

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