Many restaurant owners believe simple ingredients like mayonnaise or bread don't contain hidden allergens. That's completely wrong - mayonnaise contains eggs and often mustard, while bread typically includes gluten, eggs, and sesame. Miss these composite ingredient allergens and you're putting guests at serious risk.
What are composite ingredients?
Composite ingredients contain multiple components within a single product. You'll find these everywhere:
- Bread (gluten, possibly eggs, sesame)
- Mayonnaise (eggs, possibly mustard)
- Pesto (nuts, milk from parmesan)
- Worcestershire sauce (fish, possibly celery)
- Bouillon (celery, possibly gluten)
⚠️ Attention:
You are legally required to disclose all allergens, including those in composite ingredients. A guest with a nut allergy needs to know that parmesan is in the pesto.
Check your supplier's ingredient list
Every supplier must provide detailed ingredient lists with allergen information. You'll typically find this on:
- The product label
- The invoice or delivery note
- A separate allergen overview
- The supplier's website
💡 Example: Pesto ingredients
You use pesto from supplier X. The label states:
- Basil, olive oil, pine nuts, garlic, parmesan cheese, salt
- Allergens: nuts (pine nuts), milk (parmesan)
You must disclose these 2 allergens in your dish.
Register all allergens per ingredient
Create a comprehensive list of every composite ingredient you use and document which allergens they contain. This pattern we see repeatedly in restaurant financials - establishments that track allergens systematically avoid costly liability issues.
💡 Example: Allergen list of ingredients
- Bread (white): gluten, eggs
- Mayonnaise: eggs, mustard
- Pesto: nuts, milk
- Bouillon cube: celery, gluten
- Worcestershire: fish
Automatic calculation to dishes
Building dishes with composite ingredients means combining all allergens. A pasta pesto becomes:
- Pasta: gluten
- Pesto: nuts, milk
- Extra parmesan: milk
- Total dish: gluten, nuts, milk
💡 Example: Club sandwich
Ingredients and their allergens:
- Bread: gluten, eggs
- Mayonnaise: eggs, mustard
- Cheese: milk
- Bacon: no allergens
Total club sandwich: gluten, eggs, mustard, milk
Update when changing suppliers
Switching suppliers? You'll need to verify all ingredient lists again. Different suppliers use different recipes for identical products.
⚠️ Attention:
Mayonnaise from supplier A may contain only eggs, while that from supplier B also contains mustard. Always check this again.
Digital registration saves time
Using a system like KitchenNmbrs lets you record allergens for each ingredient once. Creating recipes automatically calculates all allergens into the final dish. You won't miss anything and don't have to recount every time.
How do you register composite ingredients? (step by step)
Collect all ingredient lists
Request the complete ingredient list with allergen information from each supplier. You usually get this on the label, invoice or via their website.
Note allergens per ingredient
Make a list of each composite ingredient and write down all allergens it contains. For example: mayonnaise contains eggs and mustard.
Calculate allergens through to dishes
Add up all allergens from all ingredients for each dish. A pasta pesto gets the allergens from pasta (gluten) plus pesto (nuts, milk).
✨ Pro tip
Audit your 8 most-used composite ingredients every 6 weeks. Suppliers change formulations without always notifying you directly.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
What if my supplier doesn't provide an allergen list?
Then you shouldn't really use that ingredient. Every professional supplier is required to provide allergen information.
How often do I need to update the allergen list?
Change suppliers and you'll need immediate updates, plus at least annually. Suppliers adjust recipes regularly, so allergens can change without notice.
Can I estimate allergens without an ingredient list?
No, that's too risky. Many allergens hide in ingredients where you don't expect them, like fish in Worcestershire sauce.
What happens if I forget an allergen?
If a guest gets sick from a non-disclosed allergen, you face serious liability risk. That's why accurate registration matters so much.
⚠️ EU Regulation 1169/2011 — Allergen Information — https://eur-lex.europa.eu/eli/reg/2011/1169/oj
The allergen information on this page is based on EU Regulation 1169/2011. Recipes and ingredients may vary by supplier. Always verify current allergen information with your supplier and communicate this correctly to your guests. KitchenNmbrs is not liable for allergic reactions.
In the UK, the FSA enforces allergen regulations under the Food Information Regulations 2014.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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