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The 14 UK Allergens

Tree Nut Allergen: Types, Cross-Contact & Storage Controls

Managing Tree Nut Allergen in Your Food Business

Tree nut allergy is one of the most dangerous food allergies, responsible for a significant proportion of fatal anaphylaxis cases in the UK. The allergen category covers almonds, hazelnuts, walnuts, cashews, pecans, Brazil nuts, pistachios, macadamia nuts (Queensland nuts), and their products. Tree nuts are distinct from peanuts (which are legumes), though many individuals are allergic to both. For food business operators, tree nuts present high-stakes allergen management challenges. They are used extensively in bakery products, desserts, sauces (pesto), confectionery, and as garnishes. Nut oils, nut butters, nut flours, and nut milks add further complexity. The severity of potential reactions means that tree nut allergen controls must be rigorous, and there is zero tolerance for mistakes.

Key takeaways

Tree nut allergy is one of the most common causes of fatal food anaphylaxis in the UK. Zero tolerance for mistakes is the right approach.
The specific nut must be named in your declaration (almond, hazelnut, cashew, etc.), not just "nuts".
Cashew paste in curries, almond flour in gluten-free baking, and hazelnut in chocolate products are commonly missed hidden sources.
Nut residue is sticky and difficult to remove. Thorough cleaning of surfaces, utensils, and equipment between nut and nut-free preparation is essential.
Every staff member should know how to recognise anaphylaxis and respond to a severe allergic reaction.

Types of Tree Nuts and Where They Appear

Each tree nut has its own uses in commercial kitchens. Almonds appear in marzipan, frangipane, macarons, praline, nougat, almond milk, almond flour (used in gluten-free baking), and as flaked or ground garnishes on cakes, salads, and curries. Hazelnuts appear in Nutella, praline, gianduja, frangelico-flavoured dishes, and as a common inclusion in chocolate and bakery products. Walnuts are used in Waldorf salad, banana bread, carrot cake, walnut oil dressings, and walnut pesto. Cashews are used extensively in Indian and Thai curries (cashew paste thickens many korma and butter chicken recipes), vegan cheese, and as snacks. Pecans appear in pecan pie, pralines, and salad toppings. Brazil nuts appear in trail mixes and some bakery products. Pistachios are used in ice cream, baklava, Turkish delight, and as garnishes. Macadamias appear in cookies, white chocolate products, and as snacks. Pine nuts (technically seeds, but included in some nut-free policies) are the base of traditional pesto. The sheer variety means tree nuts can appear in any course from starter to dessert.

Hidden Sources and Non-Obvious Nut Products

Beyond whole nuts and obvious nut dishes, tree nut derivatives are widespread. Nut oils (walnut oil, hazelnut oil, almond oil) are used in dressings and some baked goods. These refined oils may contain lower levels of allergen protein, but they must still be declared and should be treated as a risk. Nut flours (almond flour, hazelnut flour) are used in gluten-free baking, macarons, and some cakes. Nut milks are increasingly used in commercial kitchens as dairy alternatives. Nut butters (almond butter, cashew butter) appear in smoothies, dressings, and sauces. Marzipan (almond) is used in Christmas cakes, stollen, battenberg, and as a cake decoration. Praline (typically hazelnut or almond) appears in desserts and chocolate products. Some commercial sauces, particularly pesto and satay, contain tree nuts. Granola bars, cereal, trail mix, and muesli often contain multiple tree nut species. Dukkah (the Egyptian spice blend) contains hazelnuts or almonds. Even some curries, particularly from Indian and Southeast Asian cuisines, use ground cashew or almond paste as a thickener without it being obvious from the dish name.

Cross-Contact Prevention and Storage Controls

Tree nut cross-contact can occur through shared preparation surfaces, utensils, storage containers, and fryers. Nut residue on chopping boards, blenders, and food processors is a particular risk because nut proteins are sticky and difficult to remove without thorough cleaning. Key controls: store tree nuts in sealed, clearly labelled containers in a dedicated area of your dry store, separate from nut-free ingredients. Use dedicated utensils (knives, scoops, blenders) for nut-containing recipes, or clean thoroughly between uses. Never use a shared container for both nut-containing and nut-free products. Clean food processors and blenders with hot soapy water (not just a rinse) after processing nuts. On production lines, prepare nut-free products first, before handling nuts. In bakeries, nut-free products should be baked before nut-containing ones, or in separate areas, to prevent contamination from nut dust and airborne particles. For service, use dedicated serving utensils for nut-containing dishes and never use the same utensils for nut-free dishes without washing. Consider the physical layout of your kitchen: can nut preparation contaminate nearby nut-free work stations?
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Labelling, Declaration, and Emergency Response

Under the Food Information Regulations 2014, the specific tree nut must be named in the allergen declaration (e.g., "almonds", "hazelnuts"), not just "nuts". For prepacked foods, the nut name must be emphasised in the ingredients list. For restaurant menus, flag every dish containing any tree nut species on your allergen matrix. If your kitchen handles tree nuts, consider whether "may contain" warnings are appropriate for dishes prepared in the same environment. Given the severity of tree nut allergy, err on the side of caution with declarations. Staff training for tree nut allergy should include: recognising anaphylaxis symptoms (difficulty breathing, swelling, rapid pulse, dizziness), knowing the location of the customer's adrenaline auto-injector (EpiPen) if they carry one, and knowing how to call 999 and describe the situation. Speed of response is critical in tree nut anaphylaxis. Every team member should know the location of your first aid kit and the emergency protocol for allergic reactions.

What to do next

Audit all baked goods, desserts, and sauces for tree nut content

Check every cake, biscuit, pastry, dessert, pesto, curry paste, and granola product in your kitchen for tree nut ingredients. Include nut oils, nut flours, nut milks, and nut butters in your audit.

Implement dedicated nut storage with clear labelling

Store all tree nuts and nut-containing products in a designated area of your dry store. Use sealed containers with prominent allergen labels. Separate them physically from nut-free ingredients.

Train all staff on anaphylaxis recognition and emergency response

Ensure every team member can recognise anaphylaxis symptoms and knows the emergency protocol: call 999, state "anaphylaxis", assist with adrenaline auto-injector if the customer has one, and position the customer appropriately.

Common mistakes to avoid

Mistake
Labelling a dish as "contains nuts" without specifying which nut
Instead
UK law requires you to name the specific tree nut. A customer allergic to almonds but not cashews needs to know exactly which nut is present. Always declare the specific species.
Mistake
Using a blender or food processor for nut-free recipes after processing nuts with only a quick rinse
Instead
Nut proteins are sticky and persist after a simple rinse. Disassemble, wash thoroughly with hot soapy water, and dry before using equipment for nut-free preparation.

Frequently asked questions

Is coconut a tree nut?

Coconut is botanically a fruit (drupe), not a tree nut. It is not included in the tree nut allergen category under UK law and does not need to be declared as tree nut. However, some individuals with tree nut allergy also react to coconut. If a customer asks about coconut, disclose its presence and let them decide based on their own medical advice.

Are pine nuts covered by the tree nut declaration?

Pine nuts are technically seeds, not tree nuts, and are not included in the tree nut allergen category under UK food law. However, pine nut allergy does exist and can cause severe reactions. Best practice is to declare pine nuts on your allergen matrix even though they are not legally required under the tree nut category.

Can someone allergic to one tree nut eat other tree nuts?

It depends on the individual. Some people are allergic to a single tree nut species, while others react to multiple species. Cross-reactivity is common between certain pairs (e.g., cashew and pistachio, walnut and pecan). Many allergists recommend avoiding all tree nuts when allergic to one, as a precaution. In your kitchen, always ask the customer which specific nuts they need to avoid.

Is refined nut oil safe for nut-allergic customers?

Highly refined nut oils (such as refined peanut oil) have most allergenic proteins removed and may be tolerated by some allergic individuals. However, cold-pressed and unrefined nut oils retain significant allergen levels. UK law requires declaration of nut oils regardless of refining. Do not serve any nut oil to a nut-allergic customer without their explicit, informed consent.

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