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The 14 UK Allergens

Egg Allergen: Hidden Sources, Substitutes & Kitchen Management

Managing Egg Allergen in Your Food Business

Egg allergy is one of the most common food allergies in children, though many outgrow it by their teenage years. For food business operators, the challenge is that eggs are used in an extraordinary number of ways in commercial kitchens: as a binding agent in burgers and meatballs, as a glaze on pastries and breads, as an emulsifier in sauces (mayonnaise, hollandaise, bearnaise), as a key component of pasta, cakes, meringues, and custards, and even as a clarifying agent in wines and stocks. Egg allergy covers both the egg white and the egg yolk, although the major allergenic proteins (ovomucoid, ovalbumin) are concentrated in the white. Both raw and cooked egg can trigger reactions, though some individuals with egg allergy can tolerate well-baked egg in cakes but not lightly cooked egg in scrambled eggs or omelettes. Your kitchen cannot make this distinction for customers, so treat all egg as allergenic regardless of cooking method.

Key takeaways

Egg appears in glazes, batters, pasta, sauces, binders, coatings, and even some cocktails, making it one of the most widespread hidden allergens.
Both egg white and egg yolk are allergenic. Do not assume a dish is safe because it only uses one part of the egg.
Egg-free alternatives exist for most kitchen functions: binding, glazing, emulsifying, and baking.
Terms like albumin, lecithin, lysozyme, and ovalbumin on ingredient lists indicate egg-derived ingredients.

Hidden Sources of Egg in Menus

Eggs are one of the most versatile ingredients in cooking, which means they appear in places many operators do not immediately think of. Egg wash used to glaze pastries, pies, sausage rolls, and bread rolls is a common hidden source. Fresh pasta is typically made with egg. Mayonnaise, aioli, tartare sauce, salad cream, and many creamy dressings contain egg. Battered foods use egg in the batter. Quiche, frittata, and egg fried rice are obvious, but less obvious sources include: marshmallows (egg white), macarons (egg white), some ice creams (egg yolk in custard-based varieties), royal icing (egg white), some sausages and meatballs (egg as a binder), tempura batter, panko and standard breadcrumb coatings (egg used as the adhesive layer), and some commercial sauces and ready meals. Meringue is pure egg white and sugar. Hollandaise and bearnaise sauces are egg-based. Even some cocktails use egg white for foam. Check every bought-in product specification and every recipe in your kitchen for egg content.

Cross-Contact Prevention and Egg-Free Prep

Egg cross-contact often happens through shared equipment and preparation surfaces. Whisks, bowls, and utensils that have been used for egg preparation retain egg protein residue if not thoroughly washed. Work surfaces where egg wash has been applied to pastry can contaminate the next item prepared on the same surface. Deep fryers used for battered products (where egg is in the batter) will contain egg protein in the oil. To manage egg-free preparation: wash all utensils and surfaces thoroughly with hot soapy water before preparing egg-free dishes. Use dedicated bowls and whisks for egg-free baking if your kitchen does a significant volume. When applying egg wash to pastries, do it in a designated area and clean the area afterwards. Store egg-free baked goods separately from egg-glazed products to prevent contact transfer. For breakfast service, if you cook eggs on a shared griddle, clean the griddle before cooking egg-free items. Consider the order of preparation: prepare egg-free dishes before moving to egg-containing recipes where possible.

Egg-Free Alternatives for Common Uses

Many of the functions that egg performs in cooking can be replicated with egg-free alternatives. For binding (burgers, meatballs, veggie patties): ground flaxseed mixed with water, mashed banana, or commercial egg replacers work well. For glazing pastries: milk or cream provides a similar shine (though check for dairy allergy too), or use oil or plant-based milk for a vegan alternative. For batter: a mixture of flour, water or plant milk, and a small amount of baking powder produces an egg-free batter suitable for frying. For emulsified sauces: egg-free mayonnaise is widely available commercially, and aquafaba (chickpea water) can be used to make emulsified sauces in-house. For cakes and baking: commercial egg replacer powders, applesauce, or yoghurt (dairy-dependent) can substitute in many recipes. Having these alternatives available means you can offer egg-free versions of popular dishes without compromising on quality, which is both good customer service and good business.
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Labelling and Staff Communication

Under the Food Information Regulations 2014, egg must be declared whenever present as an ingredient, including as part of a compound ingredient. For prepacked foods, "egg" must be emphasised in the ingredients list. Remember to declare egg in less obvious contexts: the egg wash on a pie crust, the egg in a bought-in pasta, the egg white in a meringue nest used as a garnish. For allergen matrices, list every dish that contains egg in any form. Train staff to be aware that egg appears in many forms: lecithin (sometimes derived from egg, though soy lecithin is more common), albumin, globulin, lysozyme (used as a preservative in some cheeses), ovalbumin, ovomucin, ovomucoid, and ovovitellin are all egg-derived terms that may appear on ingredient lists. During service, when a customer declares an egg allergy, confirm the specific dishes that are safe and communicate clearly with the kitchen. The server should never guess or assume a dish is egg-free without checking.

What to do next

Audit all pastry, bread, and baked goods for egg wash

Check which items in your bakery or pastry section use egg wash for glazing. Record these on your allergen matrix and consider switching to milk or oil-based glazes where possible.

Stock an egg-free mayonnaise and batter mix

Keep a commercial egg-free mayonnaise and a simple egg-free batter recipe available for use when customers request egg-free options. Label and store separately from egg-containing versions.

Train staff on egg-derived ingredient names

Include a list of egg-derived terms (albumin, lysozyme, ovalbumin, ovomucoid) in your allergen training materials so staff can identify egg content on bought-in product ingredient lists.

Common mistakes to avoid

Mistake
Forgetting to declare egg wash on pastry items
Instead
Egg wash is an ingredient and must be declared. A sausage roll, pie, or pastry that has been brushed with egg contains egg allergen, even though the egg is not in the filling.
Mistake
Assuming all pasta is egg-free
Instead
Most fresh pasta and many dried pasta brands contain egg. Only specific egg-free dried pasta (typically made from just durum wheat and water) is egg-free. Always check the product specification.

Frequently asked questions

Can someone with an egg allergy eat food cooked in the same oil as egg-battered products?

No. Egg protein transfers to cooking oil and will contaminate other foods fried in the same oil. If you serve egg-allergic customers, either use a dedicated fryer or fry their food in clean oil before using the fryer for egg-containing batters.

Is lecithin always derived from egg?

No. Lecithin is most commonly derived from soy, but it can also come from egg. If a product lists "lecithin" without specifying the source, check with the manufacturer. Soy lecithin must be declared as soy but does not trigger egg allergy. Egg lecithin must be declared as egg.

Some egg-allergic customers say they can eat baked egg in cakes. Should I accommodate this?

Some individuals with egg allergy can tolerate egg that has been extensively heated (well-baked in cakes) because the heat changes the protein structure. However, this tolerance varies between individuals and should only be determined by their allergist. Your kitchen should not make this clinical judgment. Declare egg in all products that contain it and let the customer decide based on their own medical advice.

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UK Regulations

Food Information Regulations 2014Natashas Law (Food Information Amendment 2019)

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Egg Allergen: Hidden Sources, Substitutes & Kitchen Management | Allergen Management | Paddl | Paddl