Mustard's great disappearing act
So far we have been looking at mustard under the microscope.
Now we need to put it back in the kitchen.
And this is where mustard becomes particularly troublesome.
If somebody tells you they have an egg allergy, you might immediately think of omelettes, cakes and mayonnaise.
A peanut allergy suggests peanuts, satay and confectionery.
Ask where mustard is found and many people will picture a jar.
But mustard is an extraordinarily useful ingredient.
It can contribute heat, acidity, flavour and colour. It works in emulsions. It complements meat. It appears in spice blends. It can form part of a glaze or marinade. Whole seeds provide texture as well as flavour.
Consequently, mustard can turn up in foods where the diner may have no particular reason to expect it.
Current UK allergy guidance identifies examples including:
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mayonnaise
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barbecue sauce
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ketchup and other tomato sauces
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salad dressings
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marinades
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processed meats
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sausages
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fish paste
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pickles and piccalilli
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pizza
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salad oils.
The Food Standards Agency additionally identifies foods including breads, curries, meat products, sauces and soups as places where mustard may occur.
But memorising that list isn't really the best defence.
Understanding why mustard is being used is much more powerful.
Think like the person who made the food
Suppose you are presented with a roast chicken sandwich.
Nothing about "chicken" or "bread" immediately says mustard.
But now think about how somebody might make the sandwich more interesting.
Perhaps the chicken was marinated.
Perhaps there is mayonnaise.
Perhaps the mayonnaise has been flavoured.
Perhaps there is a honey-and-mustard dressing.
Perhaps mustard was incorporated into a sauce.
Perhaps the meat itself was supplied already seasoned.
Perhaps a spice blend was used.
Suddenly the question isn't:
"Is mustard normally in a chicken sandwich?"
It is:
"At how many points in making this chicken sandwich could somebody reasonably have used mustard?"
That is a much better way of thinking about hidden allergens.
Consider a beef burger.
The obvious ingredients may appear to be beef, bread, cheese, lettuce and tomato.
But mustard could potentially appear in the burger seasoning, burger sauce, relish, mayonnaise, barbecue sauce, marinade or dressing.
Or consider potato salad.
The potatoes are not the problem. The interesting question is what went into the dressing.
The same reasoning applies to coleslaw, vinaigrettes, devilled eggs, glazed meats, barbecue foods and numerous prepared salads.
Mustard often isn't the star of the dish.
It is part of the plumbing.
It sits underneath the obvious ingredients, helping the finished food taste the way it does.
That is exactly the sort of ingredient an allergic diner needs to think about.
Spice mixes deserve particular attention
A curry may contain mustard seed because mustard seed itself is part of the recipe.
But compound seasonings create another layer of complexity.
A cook at home can inspect the packet. A diner in a restaurant sees only the finished dish.
Terms such as "seasoning", "spices", "house spice", "marinade" or "special sauce" tell the customer almost nothing about what actually went into them.
This is one reason asking "Does this dish have mustard on it?" is not always the best question.
A better question is:
"Does this dish contain mustard in any form, including mustard seed, mustard powder, mustard oil, sauces, marinades or seasoning mixes?"
That wording encourages somebody to think beyond the yellow condiment.
Indian and other South Asian cuisines deserve particular awareness because mustard seeds and mustard oil are established ingredients in a variety of regional cooking traditions. That emphatically does not mean "Indian food is unsafe". It means mustard may be used in forms that a British diner accustomed to mustard from a jar may not immediately recognise.
Black or brown mustard seeds may be fried in oil as part of the early stages of preparing a dish. Once incorporated into a complex curry, their flavour and appearance may no longer announce themselves to somebody unfamiliar with the cuisine.
This is exactly where good allergen communication matters more than trying to identify ingredients by sight or taste.
The Italian word worth remembering
There is a linguistic trap worth knowing about.
Mostarda sounds as though it ought simply to mean mustard.
Italian mostarda can refer to a condiment involving fruit and mustard — notably preparations such as mostarda di frutta, traditionally served with foods including meats and cheeses.
To an English-speaking visitor, a beautifully presented fruit preserve may not visually resemble mustard in the slightest.
Yet mustard can be fundamental to what it is.
This is a useful lesson for travelling with any food allergy:
Translation is not just about finding the foreign word for the allergen. It is about understanding the foods and preparations in which that culture uses it.
Knowing that moutarde means mustard in French is useful.
Knowing that mustard may already be incorporated into a sauce before it reaches your plate is better.
Learning to speak mustard
For somebody with mustard allergy, a surprisingly useful piece of equipment is vocabulary.
Not medical vocabulary.
Food vocabulary.
The word mustard itself is easy enough. But the ingredient can appear as seeds, powder, flour, oil, prepared condiment, leaves or sprouts. It can also appear inside foods whose names tell an inexperienced diner very little about what they contain.
The aim is not to memorise an encyclopaedia of every recipe ever made.
It is to learn enough of mustard's disguises that an unfamiliar word prompts the right question.
That is a much more achievable task.
The obvious words are still worth knowing
On an English-language ingredients list, look for terms such as:
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mustard
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mustard seed or mustard seeds
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mustard powder
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mustard flour
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ground mustard
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mustard oil
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mustard greens or mustard leaves
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sprouted mustard seed
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mustard cress.
Prepared mustards may also be identified by style or place: Dijon mustard, English mustard, wholegrain mustard, yellow mustard, brown mustard and so on.
For a UK prepacked food, the presence of mustard as an intentional ingredient should be declared and emphasised according to the allergen-labelling rules.
That means somebody with mustard allergy should not normally need to reverse-engineer every mysterious chemical name on a British packet to discover whether the manufacturer has secretly called mustard something completely different.
This is important because allergy advice can sometimes accidentally encourage people to become frightened of ingredient lists.
The objective is not:
"If you don't recognise a word, assume it is mustard."
The objective is:
"Know the relevant names, understand the labelling system, and investigate genuine uncertainty."
E-numbers are not secret code for mustard
Long ingredients lists can look intimidating.
Modified starch.
Stabilisers.
Acidity regulators.
Emulsifiers.
Preservatives.
E-numbers.
For somebody newly diagnosed with an allergy, it can be tempting to assume that one of those unfamiliar terms might be a disguised form of their allergen.
Under UK allergen rules, however, a regulated allergen used in producing the food cannot simply be hidden from the consumer behind a generic technical term where declaration is required.
If an additive, processing aid or other ingredient is derived from one of the regulated allergens and the applicable rules require that allergenic source to be declared, the allergen needs to be identified.
So the safest approach is not to build an enormous internet-generated list of frightening chemical synonyms.
It is to understand how allergen declaration actually works.
That makes shopping easier, not harder.
Recipes are clues, not guarantees
Knowing traditional recipes can nevertheless be extremely useful when eating food that does not come with a packaged ingredients list.
Take vinaigrette.
At its simplest, it is an emulsion of oil and vinegar, usually with seasoning. But mustard is frequently added because it contributes flavour and can help stabilise the emulsion.
Does every vinaigrette contain mustard?
No.
Should somebody with mustard allergy ask?
Absolutely.
The same applies to mayonnaise-based salads, remoulade, burger sauces, marinades, barbecue sauces and numerous dressings.
The useful thought is not:
"Vinaigrette contains mustard."
It is:
"Vinaigrette is one of the places where mustard is sufficiently common that I should check."
That distinction prevents culinary knowledge turning into misinformation.
Dijon tells you where; it doesn't tell you whether
Dijon mustard takes its name from Dijon in France and is a style of prepared mustard associated with French cuisine.
For an allergic diner, however, the adjective is irrelevant to the fundamental question.
Dijon mustard is mustard.
Wholegrain mustard is mustard.
English mustard is mustard.
American yellow mustard is mustard.
Honey mustard is mustard.
Adding honey does not somehow dilute the ingredient into a different allergenic category.
The same principle applies to descriptions such as "mustard dressing", "mustard glaze" or "mustard crust".
The form and recipe can change enormously.
The presence of mustard remains what matters.
Mostarda: the fruit that deserves a second look
We met Italian mostarda earlier.
It is worth returning to because it is such a good example of how visual expectations can fail.
Traditional Italian mostarda can consist of fruit — sometimes beautifully preserved pieces of pear, cherry, apricot, fig or other fruit — combined with a pungent mustard element.
A British visitor could quite reasonably look at the dish and think:
"Fruit preserve."
The immune system may encounter:
"Mustard."
The lesson isn't merely to remember the word mostarda.
It is that culinary traditions use ingredients in ways that may be completely unfamiliar to visitors.
Travel therefore changes not only the language surrounding an allergy but the context in which the allergen appears.
A small European mustard dictionary
For travel, knowing the local word for mustard can be extremely useful.
Some common examples include:
French: moutarde
German: Senf
Spanish: mostaza
Italian: senape
Portuguese: mostarda
Dutch: mosterd
Polish: musztarda
These words help with labels and menus.
But vocabulary alone is not enough.
If you say only:
"No mustard, please,"
the person hearing you may interpret that as a preference.
They may remove the mustard garnish while leaving a mustard-containing dressing.
Or they may assume a tiny quantity doesn't matter.
The important concept to communicate is allergy.