Langoustine substitutes

Big raw prawns, ideally head-on, cooked in the shell like langoustines.

Best for

grilling and barbecuing, scampi and garlic butter, pasta, risotto, paella, seafood platters

The practical everyday answer, available everywhere and easy to cook the same way. What changes is refinement: prawn flesh has a firmer, snappier bite where langoustine is tender and almost creamy, and the flavour is straightforwardly of prawn rather than that clean lobster-like sweetness. Buy the largest you can and leave them in the shell, which protects the meat and keeps the plate looking like the dish it is meant to be. Head-on prawns are noticeably better here because the heads carry the fat and juices that give a langoustine dish its richness; squeeze them into the sauce. Cook them one to two minutes a side and no longer.

Cold-water lobster tail meat sliced crosswise into thick rounds.

Best for

pasta and risotto, butter-poaching, bisque, special-occasion dishes, salads

The nearest flavour on the market, because langoustine is a small clawed lobster and tastes like one. Lobster brings the same clean sweetness and the same faint mineral finish. Two real differences: the flesh is firmer and denser, so it gives a more substantial chew rather than langoustine's soft tenderness, and it costs at least as much, so this is a lateral move rather than a saving. Slice the tail into rounds about two centimetres thick so each piece is roughly langoustine-sized, poach it gently in butter, and stop cooking as soon as it turns opaque.

Small precooked, peeled tails of a squat lobster, sold frozen in bags despite the confusingly similar name.

Best for

pasta, risotto, bisque and soup, seafood rolls, salads, gratins

Different animal, similar result, and a fraction of the price. Langostino tails are close to the right size, they are already shelled, and the texture is soft and tender in much the way langoustine is. The flavour is milder and a bit sweeter, less complex, and the meat is a little looser and can shred if you stir it hard. The big practical difference is that they come cooked, so they cannot be seared or grilled and must simply be warmed through in the last minute off the heat. They also hold water, so drain them properly before they go anywhere near a sauce.

Small cooked freshwater shellfish tails, sold frozen in bags.

Best for

pasta and cream sauces, bisque, salads and cocktails, gratins, vol-au-vents

A sensible swap when the langoustines were destined for a sauce rather than a plate. Crawfish tails are small, soft and sweet, and they melt into a cream or tomato sauce very agreeably. They are noticeably smaller than a langoustine tail, so the dish loses its centrepiece pieces, and being freshwater they carry a slightly earthy, mineral note in place of langoustine's clean sea sweetness. They are precooked, so add them at the end. If the bag includes the orange fat, use it, as it enriches the sauce.

Premium sweet cold-water or deep-water prawns, usually sold head-on and often frozen at sea.

Best for

grilling, raw or barely cooked preparations, pasta, risotto, showpiece plates

If your fishmonger has these, this is the swap that flatters the dish most. They share langoustine's soft, sweet, slightly creamy flesh, and the heads are full of intense orange fat that makes a superb sauce or stock. Differences are mostly of degree: red shrimp and carabineros are richer and more emphatically flavoured than a langoustine, almost jammy, and the texture is softer still, so they overcook in seconds and can turn mealy. Cook them barely, thirty to sixty seconds a side over high heat, and always keep the heads.

Dense, springy white fish cut into pieces the size of a langoustine tail.

Best for

skewers and grilling, curries and stews, pasta, shellfish allergies

The choice when shellfish is not an option, or when nothing decent is in the case. Monkfish has an unusually firm, springy texture that genuinely resembles shellfish, holds its shape in a sauce and takes garlic butter well, which is why it is sometimes called poor man's lobster. What it does not have is any real shellfish flavour, so the dish loses the sweet marine character that made it a langoustine dish. Cook it in a good fish stock, add a squeeze of lemon and plenty of butter, and accept that it is a related dish rather than the same one.