Every day, restaurant kitchens handle one allergen more than any other. Gluten appears in obvious places like bread and pasta, but it's also hiding in sauce thickeners, stock cubes, and countless other ingredients. Knowing where this sneaky allergen lurks saves you from dangerous surprises with allergic guests.
Gluten: the ultimate kitchen chameleon
Gluten dominates as the most widespread allergen in restaurant kitchens. Sure, you'll find it in bread and pasta, but this protein also infiltrates ingredients where you'd never suspect its presence.
💡 Example standard kitchen:
In a typical restaurant kitchen, these gluten-containing ingredients are present:
- Flour (for sauces, breading, baking)
- Breadcrumbs (for breading)
- Soy sauce (contains wheat)
- Stock cubes (often contain wheat)
- Beer (barley contains gluten)
- Mustard (can contain wheat flour)
Result: 70-80% of your standard ingredients contain gluten
Gluten's favorite hiding spots
Six grains contain gluten: wheat, rye, barley, oats, spelt and kamut. But they appear in forms that'll surprise you:
- Sauce thickeners: Flour, cornstarch (sometimes mixed with wheat)
- Spices and bouillon: Many spice blends contain anti-caking agents made from wheat
- Processed meats: Sausage, ground meat and marinades can contain gluten
- Frying oil: Cross-contamination from fried products containing gluten
⚠️ Watch out:
Oats are naturally gluten-free, but they're often contaminated during transport and processing. Only oats with a 'gluten-free' label are safe for celiac patients.
The top 5 allergen offenders
Based on standard kitchen ingredients:
- 1. Gluten (80-90% of kitchens) - Bread, pasta, sauces, breading
- 2. Milk (70-80%) - Butter, cream, cheese, chocolate
- 3. Eggs (60-70%) - Mayonnaise, baked goods, pasta, breading
- 4. Soy (50-60%) - Soy sauce, oil, meat substitute
- 5. Mustard (40-50%) - Sauces, marinades, dressings
💡 Practical example:
A standard pasta carbonara contains 4 of the 14 allergens:
- Gluten (pasta)
- Eggs (carbonara sauce)
- Milk (parmesan)
- Possibly celery (in bacon/pancetta seasoning)
That's why systematic registration per ingredient is crucial.
Stopping cross-contamination in its tracks
After managing kitchen operations for nearly a decade, I've seen how gluten spreads through:
- Work surfaces: Flour clings stubbornly to cutting boards
- Frying oil: Once bread touches it, the entire batch is contaminated
- Equipment: Knives, spatulas, bowls carry traces
- Gloves: Change them after handling gluten products
Registration that actually works
Smart allergen tracking begins at purchasing. Review every product's ingredient list and document all 14 allergens it contains. Digital tools help you record this per ingredient and automatically calculate allergen content for your dishes.
⚠️ Watch out:
Technology assists with registration, but you remain responsible for accuracy. Always verify labels on new products and update your records whenever suppliers make changes.
How do you register allergens systematically? (step by step)
Create an ingredient list
Write down all ingredients you use, from main ingredients to spices and oils. Check the labels and note which of the 14 EU allergens each ingredient contains. Start with your most frequently used products.
Link ingredients to dishes
Go through each dish and check which ingredients it contains, then add up all the allergens. A pasta carbonara gets: gluten (pasta) + eggs (sauce) + milk (cheese). Don't forget garnishes and sauces.
Update when things change
Check monthly whether suppliers have changed their recipes. Always check new products before using them. Keep a log of when you checked what.
✨ Pro tip
Check your flour supplier's delivery schedule for the next 30 days and inspect each bag's allergen labeling. Flour mills sometimes process different grains on shared equipment, creating unexpected cross-contamination risks.
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
Are there allergens in spices and seasonings?
Yes, especially in spice blends. Many bouillon powders contain gluten, celery or soy. Pure spices like basil or oregano are usually safe, but always check the label on pre-packaged spices.
How do I prevent cross-contamination in my kitchen?
Use separate cutting boards and knives for gluten-free preparation. Change gloves after contact with allergens. Fry gluten-free products in separate oil or use a separate pan.
What if a supplier changes their recipe?
Suppliers are required to notify you of allergen changes, but this doesn't always happen on time. So check your regular products' labels monthly and update your registration immediately when changes occur.
Can I just put 'contains gluten' on my menu?
No, you must be able to provide all 14 allergens that are in a dish. Guests have the right to complete information so they can assess whether a dish is safe for them.
⚠️ 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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