I remember the first time I properly poached fish. I’d been intimidated by the technique worried about overcooking, unsure about liquid temperature, convinced I’d end up with waterlogged, flavourless results. But when I finally trusted the process and kept my court bouillon at a steady 75°C, the coral trout that emerged was a revelation: tender throughout, infused with subtle aromatics, with a delicate texture I’d never achieved through pan-searing. That was the moment poaching stopped being a method I avoided and became one I reached for – understanding that cooking in liquid isn’t about boiling or stewing, it’s about gentle heat transfer and flavour exchange.

Why Temperature Is Everything

Poaching submerges fish in liquid – seasoned water, aromatic broth, wine-based court bouillon, even milk – and that liquid does two jobs at once: it transfers heat gently and lets flavour move both ways, fish into liquid and liquid into fish. The result sits somewhere pan-searing and steaming can’t reach: tender, moist fish carrying subtle complexity from whatever it cooked in, with no crust and no concentration of flavour through reduction, just gentle cooking that lets the fish’s own character lead.

The difference between poaching and boiling is entirely temperature. Boiling – liquid at 100°C with vigorous bubbles – toughens fish and breaks it apart. Proper poaching holds liquid between 70-80°C, gentle movement but no surface bubbles. I use induction for this because it holds 75°C without constant adjustment, and I monitor with an infrared thermometer or a probe in the liquid itself – if I see bubbles starting to form, I reduce heat immediately. That range lets proteins set gradually instead of seizing, and I’m aiming for an internal temperature of 48-52°C depending on species, knowing carry-over during rest will finish the job.

None of this requires a stovetop. If you’ve got a steam oven or a combi oven, set it to the same 70-80°C and you’ll get the same result without watching a pot – that’s the temperature range I’ve called the reliable everyday zone in the steam piece, opaque and tender, and it’s exactly where I hold court bouillon on the stovetop too. Use a solid container rather than perforated, since the fish needs to sit in the liquid rather than just the steam around it, and expect roughly the same 10-12 minutes for a similar thickness. I’ve gone deeper on steam ovens in a separate piece – this is just to say the technique doesn’t belong to the cooktop.

Provenance: Why Quality Matters in Gentle Cooking

I source my fish from Fair Seafood, Australia’s only 100% fisher-to-consumer traceable seafood supplier. Poaching amplifies fish quality in both directions – unlike pan-searing, where caramelisation creates new flavours, poaching reveals what’s already there, and poor-quality fish develops off-flavours that gentle cooking can’t disguise or cover up with a crust. When I pick up ling, coral trout, or snapper, knowing exactly where it was caught and how it was handled is the difference between fish that tastes clean and sweet and fish that tastes tired, and with this technique there’s nowhere for that difference to hide.

Court Bouillon: The Foundation

Court bouillon – literally “short broth” – is a seasoned liquid built specifically for poaching, quick rather than the hours a stock needs: water, white wine or vinegar for acidity, onion, celery, carrot, bay leaves, peppercorns, and herbs. I simmer it for 20 minutes – the kitchen smells like the start of a good stew before any fish has gone near it – then strain it and let it cool to 75-80°C before the fish goes in. Boiling court bouillon shocks the exterior before the centre has time to cook.

The real reward comes after: that liquid has absorbed essence from the fish and reduces into sauce. A cup reduced by half, mounted with cold butter and fresh herbs, makes a sauce that actually tastes like the fish, because it borrowed that flavour during cooking.

Alternative Poaching Liquids

Thai-style broths are where I find myself returning. Lemongrass, galangal, kaffir lime, ginger, fish sauce, and palm sugar hit hot stock and the whole kitchen changes character – this works beautifully with barramundi, coral trout, or snapper at the same 75-80°C. Reduce the liquid, add coconut cream, lime juice, and coriander, and you’ve got a sauce that’s Thai principles applied to gentle fish cookery.

Milk or cream gives remarkably tender results for delicate species like flathead or sand whiting, the dairy doing its work without overwhelming their mild sweetness. The dual purpose is what makes it worth doing: that fish-infused milk becomes the base for a pie or chowder, so you’ve cooked the fish and built the sauce in one step rather than two separate jobs.

Simple salted water is sometimes all you need, when the fish itself is exceptional and you want nothing standing between you and its natural flavour.

Cider or wine-based liquids bring poaching back to its French roots. Normandy-style fish – cider, shallots, cream – is one of the oldest ways I know to poach gently, and it suits the cooler months when cream and butter feel right. I use a dry Adelaide Hills cider and Tweedvale cream to keep it Adelaide Hills, and I haven’t built it around one named fish – whatever firm fish Fair Seafood has that week, from Ōra King salmon to bearded rock cod, takes the cider the same way, which is the point of cooking to what’s in season. Simmer the cider with sliced shallots, poach the fish covered for 10-12 minutes, lift it out, and reduce the liquid hard before the cream goes in – too much liquid left and the sauce won’t thicken. Blue bearded mussels, Goolwa Pipis or Port Lincoln Vongole cooked separately in the same cider and folded in at the end means the sauce carries fish and shellfish liquor together – it’s the version I make when there’s a table to fill rather than just the two of us.

Species Selection: What Works Best

Ideal for poaching: firmer white fish with good structure – ling, flathead, nannygai, coral trout, bearded rock cod or snapper. They hold their shape in the liquid and absorb aromatics well without falling apart on the way to the plate.

Good for poaching with care: medium-textured fish like barramundi work well but need gentle handling on the way out of the liquid – their flesh is softer and breaks if you rush it.

Challenging to poach: very delicate species like sand whiting or yellow-fin whiting can fall apart in poaching liquid. These are better steamed, where they’re not submerged and there’s less risk of breaking apart during cooking.

Getting It Right

Use enough liquid – fish fully submerged, with at least 2-3cm above the thickest part. Skimp on it and you get uneven cooking, with whatever’s poking above the surface drying out while the rest cooks gently.

Lower fish in gently, with a fish spatula or slotted spoon – dropping it in can break the delicate flesh or splash enough to disrupt the liquid temperature. Leave space between pieces too, so they don’t stick together or cook unevenly.

Keep the pot uncovered, or loosely covered at most – a tight lid traps heat and pushes the liquid past poaching point, and you lose the visual cue of bubbles starting to form.

Trust your thermometer over the clock. A 3-4cm piece of coral trout takes roughly 10-12 minutes at 75°C to reach 48-50°C internal, but thickness varies too much to rely on timing alone. Don’t skip seasoning the liquid itself either – it should taste slightly over-seasoned on its own, since the fish will dilute it.

Pull the fish at 48-50°C and rest it 2-3 minutes – carry-over cooking finishes the job without you needing to leave it in any longer.

Building Your Poaching Confidence

Start with something forgiving – ling or flathead – in a simple court bouillon cooled to 75°C, and poach a centre cut for 10-12 minutes, watching the thermometer rather than the clock. Properly poached fish turns opaque but stays glossy, flakes softly under gentle pressure, and feels resilient rather than firm in the centre.

The temperature you pull it at changes what you get. At 48-50°C the texture is silky and barely-set, almost translucent – that’s the distinctive poached texture I’m teaching here. At 52-55°C it’s more traditionally “cooked through”: opaque, still tender, less silky but more familiar. Push to 58-60°C and it’s fully opaque and firmer – still good, but you’ve lost some of the gentle-cooking advantage that made you poach it in the first place.

If 48-50°C feels too far from what you’re used to, pull it at 52-55°C for your first few attempts – still tender and moist, just less of that silky, barely-set texture. Once you’re comfortable, work your way down and feel the difference for yourself.

Then try the cider version. The Normandy-style poach with shellfish folded in at the end is where I’d send a confident poacher next – the technique doesn’t change, only the liquid and what you build around it does.

Poaching represents a different approach to fish cookery: gentle heat transfer through liquid, flavour exchange rather than flavour concentration, texture that emphasises tenderness over crust. It’s not about replacing pan-searing or steaming – it’s about adding another tool that creates results those methods can’t match. Knowing when to poach, when to steam, when to sear is what gives you real control over texture and flavour, and makes you a more versatile cook.

What’s your experience with poaching fish? Have you tried Thai-style poaching liquids, or used the milk method for a pie or chowder base?

If you’re not sure whether what’s in the case today will hold together in liquid or fall apart, ask before you buy. The Fair Seafood team can tell you what came in this morning and which species suit exactly what you’re planning to cook – that conversation at the counter saves you a wasted fillet more often than any technique in this article.

A growing set of recipes built around these poaching techniques is now live on the Fair Seafood website – worth a look next time you’re planning a poach and want a starting point rather than a blank pan.

The cooking style and cuisine guideline is available – ask the team at Fair Seafood.

Each technique covered in the guideline is being explored in depth through the AncientGrains63 journal series. Follow along at @AncientGrains63 as each article unpacks a different method, species, and the stories that meet the plate.