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Crustaceans: more than prawns on a plate

Crustaceans are a defined group of shellfish, including prawns and shrimp, crab, lobster and crayfish. They can be the main ingredient, but they also appear as concentrated flavour in stocks, pastes and sauces, which is where avoidance becomes trickier. This page clarifies what is usually meant by crustaceans in cooking, the kinds of ingredients that can contain them, and the practical kitchen points that help reduce accidental exposure.

What counts as crustaceans in the kitchen

In everyday cooking, crustaceans are the hard-shelled shellfish such as prawns (shrimp), crab, lobster and crayfish. They are used fresh, frozen, cooked or raw, and they can be peeled or served in the shell. Beyond whole seafood, crustaceans are also used to make intensely flavoured bases: prawn stock, crab bisque-style soups, and shellfish reductions. Some cuisines use shrimp paste or dried shrimp as a seasoning, and those ingredients can be easy to miss because they are used in small amounts. Crustaceans are distinct from molluscs (such as mussels, clams, oysters and squid), though people who avoid one group sometimes avoid both depending on their needs.

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Avoidance, cross-contact and ingredient checks

This label supports allergen-aware browsing, but it cannot guarantee a recipe is safe for you. If you avoid crustaceans, check for prawns/shrimp, crab, lobster and crayfish, plus ingredients such as shrimp paste, dried shrimp and shellfish stocks. Cross-contact is common with shared frying oil, grills, steaming baskets and prep surfaces in mixed-seafood kitchens. Even at home, utensils and boards used for peeling prawns or cracking crab can spread residue unless washed thoroughly.

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Replacing crustaceans without forcing a seafood imitation

If crustaceans are there for texture, you will usually get a better result by choosing a different centrepiece rather than trying to mimic prawn or crab exactly. Firm fish, tofu, mushrooms or vegetables can take on a similar cooking method, but they will not bring the same sweetness and briny depth. If the recipe relies on crustacean stock or paste for savoury intensity, build flavour with alternatives such as vegetable stock, browned aromatics, tomato, seaweed for a marine note, or fermented seasonings where appropriate. The goal is to replace depth and savouriness, not to recreate shellfish flavour precisely.

Where to look next

Ingredient browsing is a practical next step when you are avoiding crustaceans, because it lets you explore alternative proteins and flavour-builders such as fish, seaweed, mushrooms or different stocks. Diet categories can also help if you are balancing seafood avoidance with other requirements, so you can narrow in on recipes that fit your overall approach to eating.

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Frequently asked questions

Are prawns and shrimp crustaceans?

Yes. Prawns and shrimp are crustaceans, along with crab, lobster and crayfish.

Are mussels and squid crustaceans too?

No. Mussels, clams, oysters and squid are molluscs, a different group of shellfish. Some people avoid both groups, but they are not the same category.

What are the most common hidden sources of crustaceans?

Shrimp paste, dried shrimp, shellfish stocks and some seafood-flavoured sauces or soups. These can be used in small amounts, so checking ingredients matters.

Is fish sauce made from crustaceans?

Fish sauce is typically made from fish, but recipes and brands vary. If you are avoiding crustaceans, read labels carefully, especially for blended seafood sauces.

Does cooking destroy crustacean allergens?

Allergens are generally proteins, and cooking does not reliably remove the risk. If you need to avoid crustaceans, treat cooked and raw forms with the same caution.

How can I reduce cross-contact at home?

Use separate boards and utensils for shellfish, wash hands and surfaces promptly, and be cautious with shared oils or grills if crustaceans are cooked alongside other foods.

Know the group, then watch the flavour bases

Crustaceans are straightforward when they are whole, but they can be harder to spot when used as paste, dried seafood or stock. If avoidance is important, focus on those concentrated ingredients and on cross-contact points such as shared oil, grills and prep tools.

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