A lower-calorie way to make Fish pie
Fish pie with a thin mash lid and leek-thickened sauce
White fish, salmon, prawns, leek and peas sit beneath a measured potato lid in a comforting fish pie for about 510 kcal.
Fish pie becomes heavy when both the filling and the mash depend on butter and cream. Here the fish poaches gently in low-fat milk, which then becomes the sauce. Soft leek adds body and a little cornflour finishes the texture. The potato is spread as a thin, ridged lid, giving more browned peaks without doubling the amount of mash.
What changes—and what stays
From with cream sauce, buttered mash and a cheese-heavy top often 680–900 kcal to 510 calories
Poach the fish in low-fat milk, thicken that same liquid with leek and use 180 grams of potato per person as a ridged lid. Fish-infused milk carries the savoury base, leek supplies sweetness, mustard sharpens the sauce and ridged potato provides the toasted finish.
| Part | Conventional | Lighter | Why |
|---|---|---|---|
| Core method | More added fat or a heavier proportion | Poach the fish in low-fat milk, thicken that same liquid with leek and use 180 grams of potato per person as a ridged lid | Fish-infused milk carries the savoury base, leek supplies sweetness, mustard sharpens the sauce and ridged potato provides the toasted finish. |
How the flavor stays
Fish-infused milk carries the savoury base, leek supplies sweetness, mustard sharpens the sauce and ridged potato provides the toasted finish.
A cost rule that survives inflation
Frozen white fish and peas keep the cost below an all-salmon pie, while one modest salmon portion still flavours every serving.
Ingredients for 6
Measure first; timing is part of how this recipe uses less fat.
- 600 gskinless white fish
- 300 gskinless salmon
- 240 gcooked peeled prawns
- 1.1 kgfloury potatoes
- 500 gleeks
- 350 gfrozen peas
- 800 mllow-fat milk
- 30 gcornflour
- 25 gDijon mustard
- 15 gbutter
- 20 gparsley
Method
Each step includes heat, a visible cue, and a recovery.
Step 1 · follow the visible cue
Poach large fish pieces very gently
Warm the milk with sliced leek, lower in large fish chunks and hold below a simmer until the outside turns opaque; lift the fish out.
Look for: The chunks remain firm enough to lift whole, and the milk has no curdled edge or rolling bubbles.
Step 2 · follow the visible cue
Turn the poaching milk into the filling
Continue cooking the leek until soft, whisk in dissolved cornflour and mustard, then fold in fish, prawns, peas and parsley.
Look for: The sauce clings to the fish without hiding its shape, and no watery moat appears around the baking dish.
Step 3 · follow the visible cue
Steam-dry the potatoes before mashing
Boil the potatoes, drain thoroughly and leave them uncovered for three minutes before mashing with butter and a little warm milk.
Look for: The mash is fluffy and holds peaks, rather than sliding from the spoon or showing wet patches.
Step 4 · follow the visible cue
Spread a thin lid and make many ridges
Spoon mash around the edge first to seal the filling, spread the remainder thinly, fork deep ridges and bake until the tips brown.
Look for: The top is golden at the ridges, the filling bubbles only at the rim and a serving stands without flooding.
Calories at the same serving size
230 kcal · 31% lower estimated
The estimate uses the listed ingredients divided into 6 servings. Brand labels, trimming, and the amount left in the pan can change the result.
Keep the leftovers in the same spirit
Cool promptly and refrigerate for up to two days. Reheat covered until piping hot, uncovering briefly to dry the potato top.
Cool promptly and refrigerate for up to two days. Reheat covered until piping hot, uncovering briefly to dry the potato top.
Frequently asked questions
Can the pie use only frozen fish?
Yes. Thaw it fully and pat dry before poaching so released water does not dilute the sauce.
Are the prawns included in the nutrition estimate?
Yes. The stated portion includes forty grams of cooked prawns per person.
- skinless white fish600 g
- skinless salmon300 g
- cooked peeled prawns240 g
- floury potatoes1.1 kg
CaloNote · mobile analysis example
Check the Fish pie serving you actually made
Photograph the finished plate in CaloNote, review the detected ingredients and portion, and correct the estimate before saving.
This uses the real CaloNote meal-detail layout with this recipe’s photo and estimated nutrition. Actual AI results vary with the photo and portion.
Analyze my meal in CaloNoteMethod and sources
Recipe development and nutrition review: CaloNote Editorial
This editorial recipe uses ingredient-level nutrition estimates and reviewed cooking principles. It is not represented as physically test-cooked, and nutrition is approximate.
- Food Safety Authority of Ireland — Healthy eating guidance
- Irish Universities Nutrition Alliance — Food composition data
Published and last reviewed: August 25, 2026
Make another familiar dinner lighter
Rice pudding: a lighter Irish recipe with a clear doneness check
Irish Rice pudding for eight: start rice in water, add milk gradually, and bake slowly with only occasional stirring. The measured formula uses short-grain rice, low-fat milk, water, raisins, and maple syrup; the reliable finish is the grains are tender and suspended in creaminess without a dry skin. About 345 kcal per portion.
See the recipe
Bread and butter pudding: a lighter Irish recipe with a clear doneness check
Irish Bread and butter pudding for eight: dry the bread, pour measured custard in stages, and bake until only a soft centre remains. The measured formula uses wholegrain bread, low-fat milk, eggs, raisins, and butter; the reliable finish is the corners are crisp and the custard does not leak when spooned. About 345 kcal per portion.
See the recipe