French Allergen Guide
Spot the butter, flour, and seafood traps before they spot you.
Allergen Overview
How common each allergen is in this cuisine. Always confirm with staff.
Wheat flour is a backbone for pastry, bread, noodles, and thickened sauces; croutons and bread service are frequent add-ons.
Butter, cream, and milk are common for richness; some dishes are dairy-free by default but can be finished with butter.
Eggs show up in noodles, pastries, glazes, and emulsified sauces; they may not be highlighted on menus.
Some French regions are very fish-forward; fish can also appear in broths and stews even when not obvious.
Seafood platters, stews, and mixed “fruits de mer” dishes often include shellfish or share equipment with it.
Nuts can appear in desserts, fillings, and garnishes; cross-contact in bakeries is common.
Less traditional in classic French cooking, but can appear in processed ingredients, margarine, or some dressings.
Usually avoidable, but can appear in seeded breads or as a garnish in modern bistros.
Not a classic staple, but possible via dessert garnishes, sauces, or cross-contact in kitchens using peanut oil.
Hidden Ingredients to Watch
Unexpected allergen sources that may not be obvious on menus.
Beurre (butter) finish
Adds dairy even when the menu lists only vegetables or fish
Found in: Sauces, pan-seared fish, mashed sides, vegetable sautés
Roux (flour + fat thickener)
A common gluten source that may not be listed
Found in: Soups, stews, creamy sauces, gratins
Œuf (egg) wash / glaze
Egg can be used on pastry and bread for shine
Found in: Puff pastry, turnovers, brioche-style items
Croutons / pain (bread add-ons)
Gluten can be added at the end, separate from the main dish
Found in: Soups, stews, salads, fish dishes served with bread
Mixed seafood prep
Shellfish cross-contact can happen even when a dish is labeled fish-only
Found in: Seafood stews, platters, coastal specials
Quiche
A savory custard pie baked in a pastry crust, with many regional variations (e.g., Lorraine).
Bœuf bourguignon
Boeuf Bourguignon
A Burgundy-style beef stew braised in red wine with aromatics.
Coq au vin
Coq au Vin
Chicken (traditionally rooster) braised in wine with aromatics like mushrooms and herbs.
What to Ask the Staff
Copy these questions to show restaurant staff. Available in English and French.
English
- Does this contain wheat or gluten (flour, bread, pastry)?
- Is any butter, cream, milk, or cheese used in this dish or sauce?
- Are eggs used (in the dish, batter, or as a glaze/egg wash)?
- Is the sauce thickened with flour or roux?
- Is this cooked on the same surface or in the same oil as breaded items?
- Does this contain fish or fish stock/broth?
- Does this contain shellfish (shrimp, mussels, oysters) or share seafood equipment?
- Are any nuts used (almonds, hazelnuts) or could there be cross-contact?
- Can you serve it without croutons, bread, or garnish on top?
- Do you have an ingredient list for this dessert or packaged item?
French
- Est-ce que cela contient du blé ou du gluten (farine, pain, pâte feuilletée) ?
- Est-ce qu’il y a du beurre, de la crème, du lait ou du fromage dans ce plat ou cette sauce ?
- Est-ce que des œufs sont utilisés (dans le plat, la pâte, ou en dorure) ?
- La sauce est-elle épaissie avec de la farine ou un roux ?
- Est-ce que c’est cuit sur la même plaque ou dans la même huile que des aliments panés ?
- Est-ce que cela contient du poisson ou un bouillon/fumet de poisson ?
- Est-ce que cela contient des crustacés (crevettes, moules, huîtres) ou utilise le même matériel ?
- Y a-t-il des fruits à coque (amandes, noisettes) ou un risque de traces ?
- Pouvez-vous le servir sans croûtons, pain ou garniture sur le dessus ?
- Avez-vous la liste des ingrédients pour ce dessert ou ce produit emballé ?
Menu Glossary (French)
Common menu words to help identify ingredients and allergens.
Dairy; often used to finish sauces and vegetables.
Dairy; common in sauces, soups, and desserts.
Dairy; may appear in batters, sauces, and desserts.
Dairy; can be added as a topping or mixed into sauces.
Egg allergen; used in batters, pastries, and glazes.
Often wheat-based; a major gluten source.
Primary gluten grain in bread and pastry.
Protein found in wheat; common in sauces and baked goods.
Usually contains wheat flour; frequent hidden gluten.
Gluten; used for breading and topping.
Gluten; often added to soups and salads.
Usually wheat-based; often contains butter and may be egg-glazed.
Fish allergen; can appear in stews and broths.
May include shellfish; ask for specifics.
Shellfish allergen; common in mixed seafood dishes.
Tree nut; common in desserts and fillings.
Tree nut; may appear in cakes, pralines, and garnishes.
Frequently Asked Questions
Usually no. Classic croissants are laminated with wheat flour + butter (and may include milk/egg depending on bakery). If you need strict avoidance, assume it’s unsafe unless the bakery explicitly offers a certified gluten-free, dairy-free version and controls cross-contact.
Related Guides
Explore similar cuisines and dietary guides for more allergen insights.
Dietary Guides
Important Disclaimer
Niblu is designed for everyday intolerances and preferences. It can highlight likely allergen risks and suggest questions, but it cannot guarantee safety. Always confirm ingredients, preparation methods, and cross-contact risk with restaurant staff.