White Fish Poached in a Creamy Lemon & White Wine Sauce

You want a firm, flaky fish that won’t disintegrate in the gentle heat. Cod, haddock, and hake are perfect. Thick pollock or halibut steaks also work. Avoid delicate, thin fillets like sole or plaice—they’ll overcook in a blink.

Dry white wine is ideal for its acidity. In a pinch, use 60ml of dry vermouth or a non-alcoholic substitute: 60ml of fish or vegetable stock mixed with 1 tablespoon of white wine vinegar or lemon juice. The flavour profile will be different, but still good.

You let it boil. Cream-based sauces should barely simmer. If it’s slightly grainy, immediately take it off the heat and vigorously whisk in a teaspoon of cold cream or a small ice cube. It won’t be perfect, but it’ll save dinner. Prevention is key: keep the heat low and gentle.

The 5-8 minute guideline is for a typical 1-inch thick fillet. The best test: gently press the thickest part with your finger or a fork. It should feel firm and opaque all the way through, and flake easily. Undercooked fish is translucent and resists flaking; overcooked fish is dry and tough.

You can make the base (shallots, wine, reduction) ahead. Cool it, then refrigerate. When ready to cook, reheat the base gently, stir in the cream and lemon juice, then proceed with poaching the fish. Do not cook the fish ahead. It must be poached fresh.

For a rich result, use full-fat canned coconut milk (shake it well). For a lighter version, a plain, unsweetened oat or cashew cream works, but note it won’t thicken the same way. Stir in a teaspoon of cornflour slurry at the end if it needs body.

After removing the cooked fish, increase the heat slightly and let the sauce reduce for 1-2 minutes until it coats the back of a spoon. If it’s still too thin, make a quick beurre manié: mash 1 tsp of soft butter with 1 tsp of flour and whisk it in, simmering for a minute to cook out the flour taste.

Store fish and sauce together in an airtight container in the fridge for up to 2 days. Reheat gently in a covered pan over very low heat, or in the microwave at 50% power, just until warmed through to avoid overcooking the fish. It’s excellent flaked over pasta or into a risotto.

Your heat was too high. “Cook gently” means a true medium-low. The goal is to soften and sweeten the shallot without browning it, which would add a bitter note to your delicate sauce. If it starts to colour, add a splash of wine immediately to stop the cooking.

Certainly, but with restraint. A tablespoon of capers added with the parsley is brilliant. A handful of spinach wilted into the sauce at the end adds colour. A teaspoon of Dijon mustard whisked in with the cream adds depth. Don’t overpower the fresh fish.