Allergens in Sushi and Sashimi: A Guide for UK Restaurants

Sushi and sashimi have become staples of the UK dining scene. From high-street conveyor-belt chains to independent omakase counters, Japanese-inspired restaurants now operate in virtually every major town and city. Yet with this popularity comes a significant food safety responsibility that many operators underestimate: allergen management. A single sushi menu can contain up to eight of the UK's fourteen major allergens, many of them hidden in sauces, garnishes, and processed ingredients that staff may not immediately recognise. For food business operators, getting allergen management wrong is not merely a compliance issue — it is a matter of life and death. In this comprehensive guide, we examine every allergen commonly found in sushi and sashimi, explain your legal obligations, and provide practical steps to protect your customers.

Why Allergen Management Matters in Sushi Restaurants

Sushi restaurants face a uniquely challenging allergen landscape. Unlike a traditional British menu where allergens tend to be concentrated in specific dishes, Japanese cuisine uses allergenic ingredients as foundational building blocks. Soy sauce appears in marinades, dressings, and dipping sauces across the entire menu. Sesame oil and sesame seeds feature in salads, rice toppings, and hand rolls. Fish and crustacean proteins are present not only in obvious items but also in dashi stock, fish roe, and flavour enhancers.

The consequences of poor allergen management are severe. According to the Food Standards Agency (FSA), food-induced anaphylaxis results in approximately 10 deaths per year in the United Kingdom, and many more hospitalisations. Restaurants that fail to provide accurate allergen information face prosecution under the Food Safety Act 1990, unlimited fines, and potential imprisonment. Beyond the legal ramifications, a single allergen-related incident can devastate a restaurant's reputation overnight.

Since October 2021, Natasha's Law (the UK Food Information Amendment) requires all food businesses that sell prepacked for direct sale (PPDS) items — including sushi boxes prepared on the premises for grab-and-go — to display a full ingredients list with the fourteen allergens emphasised on the label. This affects a large number of sushi restaurants that prepare bento boxes, sushi platters, and individual rolls for takeaway counters. For a detailed breakdown of the legislation, read our guide on Natasha's Law and allergen labelling.

The Allergens Found in Sushi and Sashimi

Of the fourteen major allergens that must be declared under UK food law, up to eight are routinely present on a typical sushi restaurant menu. Understanding where each allergen appears is the first step towards effective management. For a complete reference to all fourteen, see our 14 major allergens quick reference for caterers.

• Fish — Salmon, tuna, sea bass, mackerel, eel (unagi), and yellowtail are the foundation of any sushi menu. Fish is also present in dashi stock, fish sauce, and bonito flakes used in many Japanese dishes.
• Crustaceans — Prawns (ebi), soft-shell crab, crab meat, and lobster appear in nigiri, tempura, and California rolls. Crustacean proteins can also be found in miso soup and stock bases.
• Molluscs — Squid (ika), octopus (tako), scallops, and oysters are common sushi toppings. Oyster sauce, frequently used in Japanese-fusion dishes, is another source.
• Soya (soy) — Soy sauce is ubiquitous in Japanese cuisine. It appears in marinades, teriyaki glaze, ponzu, edamame, miso soup, tofu, and as a table condiment. Soya is arguably the most pervasive allergen in a sushi restaurant.
• Sesame — Sesame seeds are used as garnishes on uramaki rolls, salads, and rice dishes. Sesame oil is a key flavouring agent in dressings, gyoza dipping sauce, and stir-fried accompaniments.
• Cereals containing gluten — Wheat is present in soy sauce (brewed with wheat), tempura batter, panko breadcrumbs, and imitation crab sticks. Many customers are unaware that standard soy sauce contains gluten.
• Eggs — Tamago (Japanese omelette) is a classic sushi topping. Egg is also found in mayonnaise-based fillings (spicy mayo, dynamite sauce), tempura batter, and some imitation crab products.
• Celery — Less obvious, but celery can appear in salad accompaniments, pickled vegetable mixes, and some pre-made dressings or dipping sauces used in fusion sushi restaurants.

Hidden Allergens to Watch For

The most dangerous allergens are those that customers — and sometimes even kitchen staff — do not expect. In sushi restaurants, several ingredients contain hidden allergens that must be proactively identified and communicated.

Soy Sauce Contains Wheat

Standard soy sauce (shoyu) is brewed using a combination of soya beans and wheat. This means it contains two major allergens: soya and cereals containing gluten. Customers with coeliac disease or wheat allergy must be informed. Tamari, a Japanese soy sauce traditionally brewed without wheat, can be offered as a gluten-free alternative — but you must verify the specific product, as some tamari brands do contain small amounts of wheat. Always check supplier specifications and keep documentation.

Imitation Crab Stick (Surimi)

Surimi, or imitation crab, is used extensively in California rolls and other popular sushi items. Despite being labelled as "crab," surimi is typically made from white fish (usually pollock) processed with wheat starch, egg white, and sometimes crab extract. This single ingredient can therefore contain fish, cereals containing gluten, eggs, and crustaceans. It is essential that your allergen matrix captures every component of surimi, not just "crab."

Wasabi and Mustard

Authentic wasabi is made from the grated root of Wasabia japonica and does not contain mustard. However, the vast majority of wasabi served in UK restaurants is not genuine — it is a paste made from horseradish, mustard powder, and green food colouring. Mustard is one of the fourteen major allergens, and many operators fail to declare it because they assume wasabi is allergen-free. Always request full ingredient specifications from your wasabi supplier.

Miso and Soya

Miso paste is a fermented soya bean product and therefore contains soya. Some varieties also contain barley or rice, and cross-contamination with other allergens during production is common. Miso soup, a complimentary starter at many sushi restaurants, may also contain dashi (fish), tofu (soya), and wakame seaweed. Ensure each component is accounted for in your allergen records.

Allergen Information: Your Legal Obligations

Under Regulation (EU) 1169/2011, retained in UK law, food businesses must provide allergen information for all fourteen major allergens present in the food they serve. This applies to restaurants, takeaways, and delivery services. The law requires that allergen information is available in writing, either on the menu, on a notice directing customers to ask staff, or within a documented allergen file. Verbal communication alone is not sufficient — there must always be a written record that staff can refer to.

For sushi restaurants that sell prepacked for direct sale (PPDS) items — such as grab-and-go sushi boxes, bento trays, or individual rolls wrapped and labelled on the premises — Natasha's Law imposes additional requirements. Every PPDS item must carry a label showing the product name, a full ingredients list, and the fourteen allergens emphasised (typically in bold) within that list. Failure to comply can result in enforcement action by your local authority, including improvement notices, fines, and prosecution.

Staff training is a critical part of compliance. Every team member who handles food or takes orders must understand which dishes contain which allergens, how to communicate that information clearly, and what to do if a customer reports an allergen concern. Our Food Safety for Sushi and Sashimi course covers allergen management in detail, alongside raw fish controls, rice safety, and HACCP implementation.

Creating an Allergen Matrix for Your Sushi Menu

An allergen matrix is a grid that cross-references every dish on your menu against the fourteen major allergens. It is the single most important document in your allergen management system. For a sushi restaurant, creating an accurate matrix requires a methodical approach.

Step 1: List every dish and component. Include main courses, starters, side dishes, sauces, condiments, garnishes, and drinks. Do not overlook complimentary items such as miso soup, edamame, or pickled ginger.

Step 2: Obtain full ingredient specifications from every supplier. Do not rely on assumptions. Request product specification sheets or certificates of analysis for processed ingredients such as soy sauce, wasabi paste, surimi, tempura flour, and mayonnaise. Keep copies on file.

Step 3: Cross-reference each dish against all fourteen allergens. Mark each allergen as "contains," "may contain" (where a genuine cross-contact risk exists that cannot be eliminated), or "free from." Be honest — do not mark a dish as free from an allergen unless you can genuinely guarantee it.

Step 4: Update whenever the menu changes. Any recipe modification, ingredient substitution, or new supplier must trigger a review and update of the allergen matrix. Assign responsibility for matrix maintenance to a named member of staff and record each update with a date and signature.

Preventing Allergen Cross-Contact

Even if your allergen matrix is accurate, cross-contact during preparation can introduce allergens into dishes that should be free from them. Sushi preparation is particularly prone to cross-contact because ingredients are handled at close quarters on shared work surfaces, and many allergenic items (sesame seeds, soy sauce, fish proteins) can easily transfer via hands, utensils, or chopping boards.

• Dedicated preparation areas: Where possible, designate a specific section of your kitchen for preparing allergen-free or allergen-controlled dishes. Use separate chopping boards, knives, and containers.
• Clean equipment between uses: Thoroughly wash and sanitise all equipment, surfaces, and utensils between preparing different allergen-containing items. A quick wipe is not sufficient — traces of soy, sesame, or fish protein require proper cleaning.
• Separate storage: Store allergenic ingredients in clearly labelled, sealed containers. Keep sesame seeds, soy sauce, and other high-risk allergens away from allergen-free ingredients in fridges and dry stores.
• Staff communication: Implement a clear system for front-of-house staff to communicate allergen requests to the kitchen. Use written order tickets or digital systems rather than relying on verbal communication. Ensure the chef confirms allergen-safe preparation before the dish leaves the kitchen.
• Separate frying oils: If your menu includes tempura (which contains gluten and eggs), use dedicated fryers for allergen-free items. Shared frying oil transfers allergen proteins between batches.

Frequently Asked Questions

Is soy sauce gluten-free?

No. Standard soy sauce (shoyu) is brewed with wheat and therefore contains gluten. Tamari is often marketed as a gluten-free alternative, but not all tamari products are wheat-free. Always check the product specification from your supplier before offering it to customers with coeliac disease or gluten intolerance. Keep the specification sheet on file as evidence of due diligence.

Does sushi rice contain allergens?

Plain rice is not one of the fourteen major allergens. However, sushi rice is seasoned with rice vinegar, sugar, and salt. Some commercial sushi vinegar blends may contain traces of other allergens, so always check the supplier's ingredient list. Additionally, if sushi rice is prepared on surfaces or with equipment that has been in contact with sesame, soy, or fish, cross-contact is possible.

Do I need allergen labels on sushi platters?

It depends on how they are sold. If sushi platters are made fresh to order and served directly to the customer (either dine-in or to a specific order), they are classified as non-prepacked food and you must provide allergen information verbally or in writing (such as on the menu). However, if platters are prepared in advance, wrapped, and placed in a display for customers to select themselves, they are classed as prepacked for direct sale (PPDS) under Natasha's Law and must carry a full allergen label. The distinction is crucial — if in doubt, label it.