How do I cook one meal for a household with different dietary needs?

A household with a coeliac, a vegan, a fussy seven-year-old and someone managing their blood sugar is not unusual, and cooking four dinners every night is not sustainable. The way out is to stop thinking in dishes and start thinking in components — a base everyone can eat, and a small set of additions made once a week rather than every evening.

Safety

Step by step

1. Write down each person's need and label it honestly.Three categories. Medical: allergy, coeliac disease, a condition being managed clinically, a swallowing difficulty. Ethical or religious: vegan, vegetarian, halal, kosher. Preference: dislikes mushrooms. They are not the same and they do not get the same flexibility.
2. Find the intersection and build the base there.The base is what everybody can eat: rice, potatoes, gluten-free pasta, a vegetable-based stew, a dal, a curry sauce, roasted vegetables. Make the base to the strictest set of constraints in the house — it is nearly always easier to add than to remove.
3. Add protein and richness as components.Cook meat separately and add it to the plate rather than into the pot. Have cheese, yoghurt, a fried egg, toasted nuts or seeds available for those who can and want them. One pot, four plates.
4. Cook the strictest person's food first, on clean equipment.Where an allergy or coeliac disease is involved this is the single most important rule. Clean surfaces, clean utensils, clean pans, before anything containing the allergen or gluten comes out. Then cover their portion and set it aside, and cook everything else afterwards.
5. Keep separate equipment where you need it.A separate toaster or dedicated toaster bags for gluten-free bread, a separate colander, a separate chopping board and a separate butter and spread. Colour-coded handles make it visible so that everyone in the house, including guests, gets it right.
6. Do the substitutions once a week, not every night.Batch a gluten-free base, a vegan protein and a portion of whatever else is needed on one day and keep them in the fridge or freezer. The daily job becomes assembly, which is fifteen minutes rather than an hour.
7. Serve family style where it is safe.Everything in the middle, everyone builds their own plate. It removes both the cooking burden and the sense that one person is being catered to separately. Where there is a severe allergy, serve that person's plate first with a clean spoon before dishes are shared and cross-contaminated.
8. Read the labels every time, and keep the packaging.Recipes change without warning and a product that was safe last month may not be. Keep the packaging until the meal is over so anyone can check what was in it.
9. Watch the nutrition, not just the exclusions.A restricted diet built by subtraction tends to be short of something. A vegan diet needs a reliable B12 source; a gluten-free diet is often low in fibre and iron; a fussy child's diet narrows over time. Speak to a GP or a dietitian rather than guessing, especially for children.
10. Say when you are not sure.If you cannot be certain what is in something or whether the equipment was clean, say so. Someone who knows there is doubt can eat something else. Someone who has been reassured cannot.

Tips

• Building the base gluten-free is usually the least disruptive single decision in a mixed household, because most people cannot tell the difference in a stew, a curry or a rice dish.
• Keep a written list on the inside of a cupboard door of what each person can and cannot have. It matters most when someone else is cooking.
• A slow cooker or a big pot of something everyone can eat, plus three toppings, covers most weeknights.
• Involve people in choosing the base. A meal someone had a say in gets eaten; a meal designed around their restrictions does not always.

Common mistakes

• Treating an allergy as a strong preference — It sets the wrong standard for the whole household. Preferences can flex when the shopping was wrong; an allergy cannot, and a household that has blurred the line will eventually make a decision on the wrong side of it.
• Cooking the allergen-containing version first and washing up afterwards — Washing up is real but it is not the same as cooking on surfaces and equipment that never had the allergen on them. Order matters more than cleaning, and cooking the safe food first is free.
• Making one person a separate small meal every night — It is unsustainable for the cook and isolating for the person, and it makes the restriction the centre of every mealtime. Components on a shared base solve both.

Questions people ask