Key Stage 3 design and technology · Cooking and nutrition

KS3 food: source, seasonality and ingredient properties

In Years 7 to 9, pupils learn to understand the source, seasonality and characteristics of a broad range of ingredients, and to use that knowledge when they cook. They also apply the principles of nutrition and healthy eating in practical lessons. The result is a young person who can explain why they chose an ingredient, not just follow a list.

Source, season and ingredient properties, explained

Source means where an ingredient comes from and how it reaches the kitchen. Pupils build on primary school work on foods that are grown, reared or caught, and look at plant foods such as cereals, vegetables, fruit, nuts and pulses, and animal foods such as meat, fish, eggs and milk. They compare how foods can be produced, for example outdoors or under cover, wild-caught or farmed, and how hens or other animals were kept. They also learn about processing. Primary processing turns a raw food into something a cook can use, such as wheat milled into flour, milk pasteurised, or olives pressed into oil. Secondary processing makes those into other products, such as flour into bread or pasta, or milk into cheese or yoghurt. Labels give clues, including country of origin, the way eggs were produced and whether a product is organic.

Seasonality is the time of year when a food is naturally ready to harvest in a particular place. In the UK, asparagus has a short season in spring and early summer, strawberries are at their best in summer, apples and squashes arrive in autumn, and leeks, parsnips, kale and sprouts are typical autumn and winter crops. Shops sell most foods all year because of imports from countries with a different season, heated greenhouses and polytunnels, and cold storage. Pupils weigh up the pros and cons. Food in season is often cheaper and fresher and may taste better, but “seasonal” or “local” does not automatically mean lower in carbon, because how a crop is grown and how it travels both matter.

Characteristics are the properties that decide how an ingredient looks, tastes and behaves. Many schools group them into three kinds. Sensory properties are flavour, aroma, colour and texture. Nutritional properties are what the ingredient supplies: protein, carbohydrate, fat, fibre, vitamins and minerals. Functional properties are what it does in cooking. Examples a school might use include egg white trapping air when whisked, egg yolk helping oil and water stay mixed, wheat flour forming stretchy gluten when kneaded with water, starch thickening a sauce as it heats in liquid, and acid such as lemon juice changing proteins in a marinade. Which ingredients a school covers is its own choice, because the national wording is broad.

The second statutory aim is that pupils learn to cook and apply the principles of nutrition and healthy eating. This is taught through cooking rather than as separate theory. Pupils choose ingredients that give a balanced diet: plenty of vegetables and fruit (a commonly quoted target is at least five portions a day), starchy foods with some wholegrain, protein from beans, pulses, fish, eggs, meat or alternatives, dairy or alternatives, and only small amounts of foods high in fat, salt and sugar. They may analyse a recipe, read nutrition labels, including the per 100 g figures, and change the recipe to improve it.

Words your child will hear

Provenance: Where a food comes from and how it was produced.
Seasonal: Ready to harvest naturally at that time of year in a given place.
Primary processing: The first stage that makes a raw food usable, such as milling wheat into flour.
Secondary processing: Turning processed ingredients into other products, such as flour into bread.
Functional property: What an ingredient does in a recipe, such as thickening, binding or trapping air.
Food miles: The distance food travels from where it is produced to where it is eaten.
Shelf life: How long a food stays safe and good to eat.

What the National Curriculum says

The programme of study for Key Stage 3 says:

Pupils should be taught to understand the source, seasonality and characteristics of a broad range of ingredients
As part of their work with food, pupils should be taught how to cook and apply the principles of nutrition and healthy eating.

Objectives from the National Curriculum in England, © Crown copyright, used under the Open Government Licence v3.0.

Try it: planning a seasonal meal

It is late October. Plan a main meal for four people using mostly UK seasonal ingredients, and explain your choices using source, season and characteristics.

Season: list what is typically in season in the UK in late October, such as leeks, parsnips, carrots, cabbage, kale, squash and apples. Potatoes and onions harvested earlier and stored are also available. Choosing these is likely to be cheaper and fresher than the same vegetables imported out of season.
Source: choose chicken thighs for the protein. Check the label for country of origin and how the birds were reared, which helps weigh up cost against animal welfare. Note that a vegetarian version could use beans or eggs, so the plan works for more people.
Characteristics: chicken thighs stay juicier than breast when roasted because they contain more fat and connective tissue. Parsnips and carrots roast to sweet, browned edges because their natural sugars caramelise. Leeks turn soft and mild. A sliced apple adds sharpness that balances the richness of the meat.
Nutrition: the chicken provides protein, the vegetables provide fibre, vitamins and minerals, and potatoes with the skins left on add starchy carbohydrate and fibre. Use herbs such as thyme or sage for flavour rather than extra salt, and use a little oil rather than a lot.
Evaluate: work out the cost per portion, check that the meal is balanced, and decide what could change if a family member is vegetarian or if one ingredient is too expensive.

A tray bake of chicken thighs with leeks, parsnips, carrots and apple, served with potatoes, is a sound choice for late October: the vegetables are in season so should be fresher and cheaper, each ingredient was chosen for how it tastes and behaves when roasted, the plate is balanced with protein, fibre and vegetables, and beans can replace the chicken if needed.

Common mistakes and how to help

Assuming local or seasonal food is always better for the environment

The message is simple and often true, so pupils apply it everywhere. In reality, a crop grown in a heated greenhouse can have a bigger footprint than one grown outdoors abroad and shipped, and the journey is only one part of the whole picture.

What helps: Ask three questions together: how was it grown, how was it stored, and how did it travel? Comparing two real products from the fridge makes the idea concrete.

Believing fresh is always more nutritious than frozen or tinned

“Fresh” sounds healthier. But vegetables frozen soon after harvest can keep their nutrients well, while fresh produce stored for days can lose some vitamin C.

What helps: Talk about how long the fresh item has been in transit and storage. Frozen and tinned foods are practical, cheaper and reduce waste, though check tinned foods for added salt or sugar.

Saying that processed food is always unhealthy

People use “processed” to mean pre-packaged, ready meals or sweets. But flour, pasteurised milk, tinned tomatoes and frozen peas are all processed.

What helps: Ask what has been done to the food and what was added. A little processing makes food safer or easier to use. Heavy processing with a lot of added salt, fat or sugar is the concern.

Treating similar-looking ingredients as interchangeable

Plain and self-raising flour, butter and spreads, or single and whipping cream look similar, but they behave differently. Single cream will not whip because it has too little fat.

What helps: When a recipe fails after a swap, treat it as useful information. Ask what property the original ingredient had, and whether the replacement shares it.

How to help at home

Read the label together. When unpacking the shopping, pick three foods and find where they come from and how they were produced, using the label. Ask which are in season in the UK now and which have travelled furthest. Notice, without judgement, what influences the choices you make.
Follow one ingredient from field to plate. Choose wheat, milk or potatoes and talk through each stage: how it was grown or reared, what primary processing it went through, and which products it becomes. A loaf, a block of cheese or a packet of chips each tell a story.
Make a taste comparison. Compare two varieties of apple or tomato, or fresh and frozen peas, and ask your child to describe appearance, smell, flavour and texture. Frozen vegetables should be cooked before eating, so cook the peas, with an adult supervising the hob and any sharp knife.
Create a seasonal calendar. Make a simple list on the fridge showing what is in season each month in the UK, and add recipes the family has made with each. Encourage your child to plan one meal around what is in season and cheap.
Ask what each ingredient is doing. While cooking, ask “why is the egg in here?” or “why use oil rather than water?” Answers like “it holds it together” or “it carries flavour” are the functional properties pupils are taught to think about.

Builds on

Key Stage 2: Healthy and varied diet
Key Stage 2: Cooking savoury dishes
Key Stage 2: Seasonal food
Key Stage 2: Grown, reared, caught, processed