British · Seafood
Three Fish Pie
About this recipe
British cooking traditions favour generous root vegetables, slow-cooked meats, hearty puddings, and the kind of food that warms a damp island. The everyday repertoire prioritises preservation and shared family meals; the special-occasion repertoire (roast beef, Christmas pudding) is among the most globally recognised.
As a seafood dish, Three Fish Pie demands timing precision: the difference between perfect and overcooked is often less than 90 seconds, and the result of overshooting is a textural penalty there's no fixing.
Set your servings in the scaler above and every line of the recipe rewrites itself with smart fractions and unit promotion. Open Cook Mode to step through it hands-free with timers running.
Recipe data is sourced from TheMealDB's open community database; ScaleRecipe handles the curation, the scaling math, the editorial commentary, and the conversion utilities woven into each page.
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Method
- Preheat the oven to 200C/400F/Gas 6 (180C fan).
- Put the potatoes into a saucepan of cold salted water. Bring up to the boil and simmer until completely tender. Drain well and then mash with the butter and milk. Add pepper and taste to check the seasoning. Add salt and more pepper if necessary.
- For the fish filling, melt the butter in a saucepan, add the leeks and stir over the heat. Cover with a lid and simmer gently for 10 minutes, or until soft. Measure the flour into a small bowl. Add the wine and whisk together until smooth.
- Add the milk to the leeks, bring to the boil and then add the wine mixture. Stir briskly until thickened. Season and add the parsley and fish. Stir over the heat for two minutes, then spoon into an ovenproof casserole. Scatter over the eggs. Allow to cool until firm.
- Spoon the mashed potatoes over the fish mixture and mark with a fork. Sprinkle with cheese.
- Bake for 30-40 minutes, or until lightly golden-brown on top and bubbling around the edges.
Cooking notes
Scaling works best when you weigh ingredients rather than measure by volume — small differences in packing can compound at higher multipliers.
For volume-to-weight conversions of any ingredient — flour, sugar, butter, salts — use the ingredient converter. To translate the recipe's oven temperature between °C, °F and gas mark, see the temperature converter.
When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.
Scaling notes
Scaling Three Fish Pie
Three Fish Pie is written for around four servings as it stands on this page — scaling it up for a party or down for a meal-for-one is the small math problem most home cooks face every week. Here's how this particular dish responds to scaling, what changes linearly, and what doesn't.
Seafood is the most scaling-sensitive protein because the overcooking window is narrow and the penalty is steep. Scale Three Fish Pie per piece if you can — cook three fillets in two batches rather than crowd the pan into one. Sauce-based seafood dishes scale linearly, but always taste before adding more salt: brininess from the seafood itself doesn't scale predictably.
This recipe calls for eggs, which are the trickiest ingredient to scale to non-integer multiples. A US "large" egg weighs about 50 g; if a fractional scaling lands on, say, 1.5 eggs, beat one egg and weigh 25 g of the beaten mixture rather than guessing. The same goes for halving recipes — half an egg is 25 g of beaten egg, not a dramatic estimate.
When you scale the flour in this recipe, weigh it in grams if you can — a cup of flour can weigh anywhere from 113 g to 150 g depending on how you measure. The ScaleRecipe ingredient converter uses the King Arthur Baking reference of 120 g/cup for all-purpose flour, which is the same standard most modern baking books assume.
Skip the math entirely — ScaleRecipe's scaler rewrites every ingredient line above with proper culinary fractions and smart unit promotion the moment you change the serving count. Open the scaler →
Beyond the recipe
Substitutions & make-ahead — Three Fish Pie
Two things home cooks ask about most when they're outside the recipe's exact assumptions: what swaps work for which ingredients, and how the dish behaves when you make it ahead. Both depend on what Three Fish Pie is doing structurally — here's the practical version.
Substitution ideas
Eggs
For binding (cookies, quick breads, meatballs): 1 large egg ≈ 1 tbsp ground flaxseed + 3 tbsp water, rested 5 minutes until gelled — structurally closest to a real egg. For moisture without structure (cakes, brownies): ¼ cup unsweetened applesauce or mashed banana per egg, accepting some loss of rise.
Butter
For sautéing or browning, equal-weight olive oil or a neutral oil works directly. For baking, equal-weight coconut oil (melted, then chilled to the same softness the recipe expects) gives a buttery richness; a quality vegan butter brick is the structural match for cookies and pastries where firmness matters.
Dairy milk
Unsweetened soy milk substitutes 1:1 in custards and baked goods (the protein content matches). Oat milk gives a creamier mouthfeel for soups and coffee drinks. Almond milk works for lighter applications. Skip coconut milk in savoury recipes unless the dish calls for it — the flavour is unmistakable.
For weight-based swaps and arbitrary quantities, the ingredient density converter and the cup-to-grams chart cover most pantry staples.
Make-ahead and storage
Seafood is the worst-tempered category for make-ahead — texture and flavour both degrade quickly after cooking. Three Fish Pie should ideally be cooked the day it's served. If a make-ahead is unavoidable, prep components (the sauce, marinade, vegetables, garnishes) the day before and cook the fish or shellfish at the last moment. Cooked seafood develops a pronounced fishy off-flavour within 24 hours even when properly refrigerated.
Recipe video
Three Fish Pie
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Cooking aids
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Each opens in a new tab so the timer keeps running. The math is auditable on the guide page below each converter, with worked examples and where the numbers come from.
Volume
Tablespoons, teaspoons, cups, ml, fluid ounces — every culinary volume unit, with US/metric/imperial cups handled distinctly.
OpenWeight
Grams, ounces, pounds, kilograms — exact for any ingredient, plus the volume-to-weight conversions for ~40 pantry staples.
OpenTemperature
Fahrenheit, Celsius, gas mark — translate any oven temperature, with notes on conventional vs convection.
OpenCooking time
The cube-root rule for scaling up, the differences between meat / cake / soup geometry, and sensible starting estimates.
OpenPan size
9-inch round vs 8-inch square vs 13×9. The math is surface area, not diameter — and the converter shows you both.
OpenLength
Inches and centimetres — for when a recipe says “cut into 1-inch pieces” and your ruler is metric.
OpenIngredient density
A cup of flour weighs 120 g; a cup of honey weighs 340. The full table of ~40 staples, with sources.
OpenOpen in main scaler
Edit the recipe text, scale by serving count, and copy the result. Same parser as the in-page scaler, more room to work.
OpenFrom the journal
Original essays on the small details.
The why behind the technique — original writing on the ingredient and equipment choices that separate a good cook from a frustrated one.
Reading a recipe like a chef
The 30-or-so recipe terms that show up most often, decoded
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Cooking for one — scaling principles
The math, the practical realities, and the recipes designed for one from the start
Read essayMay 4, 2026
How long do leftovers actually last?
Beyond the USDA's 3–4 days: the variables that actually determine the safe window
Read essayMay 4, 2026
Go deeper
Where this recipe sits in the wider tradition.
Each guide below is a real essay on the cuisine or the category — pillars, staples, techniques worth learning — paired with a curated grid of recipes filed under it.
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