The 14 UK Allergens
Peanut Allergen: Cross-Contact Prevention & Kitchen Protocols
Managing Peanut Allergen in Your Food Business
Peanut allergy is the most well-known food allergy in the UK and one of the most dangerous. Peanuts are legumes (not tree nuts), but they are responsible for more cases of fatal food anaphylaxis than almost any other allergen. Even trace amounts can trigger life-threatening reactions in sensitive individuals. For food business operators, peanuts present a unique set of challenges: they appear in satay sauce, many Asian and African cuisines, peanut butter, groundnut oil, some confectionery and bakery products, and as hidden ingredients in sauces and dressings. The emotional and legal stakes of getting peanut allergen management wrong are extremely high, as several high-profile UK fatalities from undeclared peanut in restaurant food have led to criminal prosecutions. Rigorous allergen management is not optional.
Key takeaways
Peanut allergy is one of the leading causes of fatal food anaphylaxis in the UK, and UK courts have issued criminal convictions for undeclared peanut.
Satay sauce, Asian condiments, peanut butter in smoothies and dressings, and groundnut oil are the most common hidden sources.
Peanut protein is persistent and difficult to remove from surfaces. Hot soapy water cleaning is essential, not just wiping.
Every staff member should know how to recognise anaphylaxis and respond, including assisting with adrenaline auto-injector use.
Cross-reactivity with lupin means peanut-allergic customers should also be warned about lupin-containing products.
Where Peanuts Hide in Menus
Peanuts and peanut derivatives are used more widely than many operators realise. Satay sauce (peanut-based) is used in Thai and Southeast Asian dishes. Peanut butter appears in smoothies, dressings, baking, and some African stews and sauces. Groundnut oil (peanut oil) is used for frying in some kitchens, though highly refined peanut oil is legally exempt from declaration in some contexts due to very low protein content. However, cold-pressed and unrefined peanut oil is a significant risk. Peanut flour is used in some commercial baking, particularly in the US-style baked goods and confectionery increasingly found in UK cafes. Many Asian condiments, particularly from Thai, Indonesian, Malaysian, and Chinese cuisines, contain peanut: pad Thai, gado-gado, some noodle sauces, and dipping sauces. Some ice creams, chocolates, and confectionery contain peanut. Peanuts are a common inclusion in trail mix, muesli, and snack bars served in cafes and hotels. Arachis oil (another name for peanut oil) may appear on ingredient lists. Monkey nuts are peanuts in their shells. The key audit step is to check every sauce, dressing, snack product, and dessert in your kitchen for peanut or groundnut content.
Cross-Contact Prevention Protocols
Peanut protein is persistent, sticky, and difficult to remove. It survives cooking temperatures and transfers easily between surfaces, utensils, and foods. Cross-contact protocols for peanut must be the most rigorous in your kitchen. Store peanuts and peanut-containing products in sealed, clearly labelled containers in a designated area, physically separated from peanut-free ingredients. Use dedicated utensils, boards, and equipment for peanut-containing dishes. Never use the same knife, spoon, or spatula for peanut-containing and peanut-free dishes without thorough washing. Clean all surfaces with hot soapy water after handling peanuts - a quick wipe with a damp cloth does not remove peanut protein effectively. Shared fryers are a major risk if peanut-containing items (satay, coated snacks) are fried in them. If possible, do not fry any peanut-containing items in shared oil. In bakeries and dessert preparation, airborne peanut particles from grinding or crushing can contaminate nearby products. Separate the timing or location of peanut and peanut-free preparation. Consider whether your kitchen layout creates unavoidable cross-contact risks and address them structurally, not just procedurally.
Labelling, Declaration, and Legal Context
Under the Food Information Regulations 2014, peanuts must be declared whenever present. The term "peanuts" must be emphasised in ingredients lists for prepacked foods. For your allergen matrix, every dish containing peanut in any form must be flagged. Be aware of the legal context: several UK food business operators have been criminally prosecuted (and in some cases imprisoned) following fatalities caused by undeclared peanut allergen. The courts treat failure to declare peanut as a foreseeable and preventable risk, and manslaughter charges have been brought. This is not a theoretical risk. Your allergen management system for peanut must be documented, consistently followed, and regularly audited. Declarations must cover all forms: peanuts, peanut butter, peanut oil (unrefined), peanut flour, groundnut, arachis oil, and any product containing peanut derivatives. Train every member of staff on the seriousness of peanut allergy and ensure that allergen queries from customers are always taken seriously, never dismissed or treated casually.
The 14 UK Allergens
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Given the severity and speed of peanut anaphylaxis, every food business that serves peanut-containing dishes should have an emergency response plan. Symptoms of anaphylaxis include: difficulty breathing, swelling of the throat and tongue, rapid pulse, dizziness, loss of consciousness, and widespread hives or skin flushing. These can develop within minutes of exposure. Your team should know: call 999 immediately and state "anaphylaxis". If the customer has an adrenaline auto-injector (EpiPen or similar), assist them in using it if they are unable to do so themselves - the injection goes into the outer thigh. Lay the customer flat with legs raised unless they are having difficulty breathing, in which case sit them up. Do not leave the customer alone. A second dose of adrenaline may be needed if symptoms do not improve within 5 minutes. Record the time of the first injection so paramedics know when it was administered. After any allergic reaction incident, complete an incident report, review your allergen controls to identify how the exposure occurred, and take corrective action to prevent recurrence.
What to do next
Check all Asian sauces, dressings, and condiments for peanut content
Audit every Thai, Indonesian, Malaysian, and Chinese sauce in your kitchen for peanut or groundnut ingredients. Include satay sauce, pad Thai sauce, dipping sauces, and any nut-based curry pastes.
Create and display a peanut anaphylaxis emergency protocol
Write a clear, step-by-step emergency response protocol for anaphylaxis and display it in the kitchen and front-of-house areas. Include 999 contact, adrenaline auto-injector instructions, and positioning guidance.
Review your kitchen layout for peanut cross-contact risks
Walk through your kitchen and identify every point where peanut cross-contact could occur: shared surfaces, fryers, storage areas, blenders, utensils. Implement physical separations or process controls for each risk.
Common mistakes to avoid
Mistake
Assuming refined peanut oil is always safe for peanut-allergic customers
Instead
While highly refined peanut oil has most protein removed, cold-pressed, unrefined, and aromatic peanut oils are significant risks. Always declare peanut oil and let the customer decide, ideally with input from their allergist.
Mistake
Treating peanut allergy queries casually or dismissively
Instead
Peanut allergy has caused fatalities in UK restaurants. Every peanut allergy query must be treated as a serious, potentially life-threatening concern. Never guess, never dismiss, always check.
Frequently asked questions
Are peanuts the same as tree nuts?
No. Peanuts are legumes (related to beans, lentils, and soy), while tree nuts (almonds, walnuts, cashews, etc.) grow on trees. They are separate allergen categories under UK law. However, many people are allergic to both, so always ask the customer whether they need to avoid tree nuts as well.
Is groundnut oil the same as peanut oil?
Yes. "Groundnut" is another name for peanut. Groundnut oil, arachis oil, and peanut oil are all the same product. If any of these terms appear on an ingredient list, it must be declared as peanut allergen.
Can peanut-allergic customers eat food that has been cooked in the same fryer as peanut-containing items?
No. Peanut protein transfers to cooking oil and contaminates any food fried in the same oil. If you fry peanut-containing items, anything else fried in that oil must be treated as containing peanut allergen.
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