The Still Room

Drying and preserving food at home

Sun, oven and dehydrator — what each method suits, and how to store the result so it lasts.

Lisa · Filed under The Still Room

What’s in this guide

• Why dried food belongs in every South African pantry
• How does drying actually preserve food?
• What are the best methods for drying food at home?
• What foods dry well (and what to avoid)
• How long does dried food last, and how do you store it?
• Safety, rehydration and common mistakes
• Key takeaways
• Frequently asked questions

Dried food is the oldest, cheapest and most forgiving form of food preservation we have, and most of what you have read about it online overcomplicates it. You do not need a fancy machine, a vacuum chamber or a doomsday bunker. You need warm air, patience and a little understanding of why it works.

I have lived off-grid on a smallholding for more than a decade, and dried food is the quiet backbone of my pantry. When the power goes off, a jar of dried beans or biltong does not care. It sits there, stable and ready, asking nothing of you.

This guide is about competence, not panic. By the end you will understand the simple science, the practical methods that suit our climate, and how to build a store that actually feeds you well.

Why dried food belongs in every South African pantry

Dried food is the most load-shedding-proof way to store food, because once it is dry it needs no fridge, no freezer and no electricity to stay good. That single fact makes it more reliable than almost anything else in your kitchen.

We live with intermittent power. A chest freezer is wonderful until Stage 6 leaves it warm for eight hours at a stretch. Dried food sidesteps that entire problem. It is also remarkably light and compact — drying tomatoes shrinks them to roughly a tenth of their fresh weight, which matters if you are storing a harvest in a small space.

There is an economic case too. Buying in-season produce when it is cheap and drying the surplus is one of the best returns on effort I know. A 10kg crate of tomatoes at a fraction of off-season prices becomes jars of intense flavour that last all winter. If you grow your own, drying is simply how you stop a glut from rotting on the vine.

For more on planning your stores sensibly, see our guide on food storage basics.

How does drying actually preserve food?

Drying preserves food by removing water until microbes and enzymes can no longer function. Bacteria, yeasts and moulds all need moisture to grow, so when you bring a food’s water content low enough, spoilage simply stops.

Scientists describe this using water activity (aw) — a measure of available, unbound water on a scale from 0 to 1. Most bacteria cannot grow below an aw of about 0.85, and moulds struggle below roughly 0.60. According to the US Food and Drug Administration, properly dried foods sit well under these thresholds, which is why a dry bean stays good for years while a fresh one rots in days.

This is the part most people get wrong: drying is not about cooking the food. It is about gently moving moisture out of it. Too much heat seals the outside, traps water inside and invites mould. Steady, moderate warmth with good airflow is what you are after.

What are the best methods?

The best method depends on your climate, your power situation and what you are drying. In South Africa you have four practical options, and you do not need to choose just one.

1. Sun drying

Our climate is genuinely suited to this. Hot, dry summers on the Highveld and in the Karoo will dry tomatoes, chillies and fruit in a few days. Use raised mesh trays, cover with a light cloth or netting to keep flies off, and bring trays indoors overnight so dew does not undo your work. It is free, but it is weather-dependent and slower.

2. Oven drying

An oven set to its lowest temperature, ideally 50–60°C with the door propped slightly open, works well for small batches. It uses power, so it is less ideal during load-shedding, but it gives you control and consistency when the weather will not cooperate.

3. Electric dehydrator

A dedicated dehydrator is the most reliable and consistent method. It holds a steady low temperature, moves air evenly and frees you from watching the weather. Mid-range units run from roughly figure being sourcedto figure being sourcedin ZAR. If you dry food regularly, it pays for itself.

4. Air drying

Herbs, chillies and biltong have been air-dried for centuries. Bundle herbs and hang them in a dry, airy, shaded spot. Biltong needs a simple ventilated box and a fan — a deeply South African tradition that is, at heart, just controlled drying.

Method	Power needed	Speed	Best for	Rough cost (ZAR)
Sun drying	None	Slow (2–5 days)	Tomatoes, fruit, chillies	Free
Oven	High	Fast (6–12 hrs)	Small batches	Electricity only
Dehydrator	Moderate	Medium (6–14 hrs)	Everything, consistently	figure being sourced–figure being sourced
Air drying	Little to none	Slow (days)	Herbs, biltong, chillies	Low

What foods dry well (and what to avoid)

Lean, low-fat foods dry best, while anything high in fat or moisture tends to spoil rather than store. As a rule, if it is naturally lean or you can slice it thin, it will dry well.

These are reliable starters:

• Herbs — basil, oregano, rosemary, thyme. The easiest entry point and almost foolproof.
• Tomatoes — halved and seeded, they become intensely flavoured and store beautifully in oil or jars.
• Beans and legumes — let them dry on the plant, then shell. The backbone of a real food store.
• Fruit — apples, pears, mango, banana. Pre-treat pale fruit with lemon juice to stop browning.
• Chillies — thread them and hang. They keep for a year or more.
• Lean meat — biltong and jerky, done with proper attention to salt and airflow.

Avoid drying anything fatty or high in oil. Avocado, fatty meat, full-cream dairy and oily fish go rancid because their fats oxidise rather than preserve. Eggs and dense, watery vegetables like cucumber are also better handled by other methods.

If you grow your own, pair this with our notes on growing your own vegetables so your drying schedule follows your harvest.

How long does dried food last, and how do you store it?

Properly dried and well-stored food keeps anywhere from several months to several years, depending on the food and your conditions. Dried herbs hold flavour for about a year; dried beans and grains can stay good for years.

The three enemies of dried food are moisture, light and heat. Beat those and your store lasts. According to the National Center for Home Food Preservation, dried foods stored in airtight containers in a cool, dark place retain quality far longer than those left exposed.

Here is the routine I follow:

• Cool completely before packing, or condensation forms and ruins everything.
• Condition for a week — pack loosely in a jar and shake daily. If moisture appears, dry the batch further.
• Store airtight in glass jars or sealed containers. Oxygen absorbers extend life for long-term stores.
• Label and date every container. Memory is not a storage system.
• Keep cool and dark — a cupboard away from the stove is ideal.

Dried food	Typical shelf life	Best storage
Herbs	1–2 years	Dark glass jar
Tomatoes	6–12 months	Airtight jar or in oil (fridge)
Dried beans	2–5 years	Sealed container, oxygen absorber
Dried fruit	6–12 months	Airtight, cool, dark
Biltong	2–4 weeks (longer if very dry)	Paper bag, cool airflow

Safety, rehydration and common mistakes

The biggest safety rule is simple: dry food thoroughly, store it dry, and check it before you eat it. Under-drying is the single most common cause of spoilage and the easiest mistake to fix.

Properly dried food should be leathery or brittle, never soft or moist in the middle. If you see any mould, discard the whole batch — do not cut around it. Drying does not make spoiled food safe; it only preserves food that was sound to begin with.

To rehydrate, soak in water, stock or juice. Beans need hours and a proper cook; dried tomatoes plump up in warm water within 20 minutes. Dried vegetables go straight into soups and stews, rehydrating as they cook.

A few common mistakes worth avoiding:

• Packing warm food — trapped steam becomes condensation and mould.
• Drying at too high a heat — it case-hardens the surface and traps moisture inside.
• Skipping conditioning — uneven moisture spreads spoilage through a whole jar.
• Storing in direct light — it fades colour, flavour and nutrients.

Treat drying as a trainable skill, not a personality trait. Your first batch of biltong might be uneven; your fifth will be excellent. That is how it goes.

Key takeaways

• Dried food stores months to years without electricity, making it ideal for load-shedding.
• Preservation works by removing water until microbes and enzymes can no longer act.
• Sun, oven, dehydrator and air drying all work — choose by climate and budget.
• Lean, low-moisture foods dry best; fatty foods go rancid and should be avoided.
• Store airtight, cool and dark, and always condition before long-term storage.
• Under-drying is the main failure point — aim for leathery or brittle, never soft.

Frequently asked questions

How do you know when dried food is properly dried?

Properly dried food feels leathery or brittle with no soft, moist spots inside. Tear a piece open and check the centre — if it is still pliable or damp, keep drying. Fruit should be pliable but not sticky; vegetables and herbs should be crisp; beans should be hard. Conditioning in a jar for a week confirms there is no hidden moisture.

Is sun-dried food safe in South Africa’s climate?

Yes, our hot, dry summers suit sun drying well, provided you use raised mesh trays, cover food with netting against insects, and bring trays indoors overnight to avoid dew. Sun drying suits low-moisture foods like tomatoes, chillies and fruit. Meat is safer in a ventilated box or dehydrator where airflow and temperature are more controlled.

Does drying food destroy its nutrients?

Drying preserves most nutrients, though some heat-sensitive vitamins, especially vitamin C, decline. Minerals, fibre and most other nutrients survive well. Lower drying temperatures protect more nutrients, which is one reason gentle, steady warmth beats high heat. Dried food remains a nutritious, concentrated source of energy and minerals when stored properly in cool, dark conditions.

Do I need a dehydrator, or will an oven do?

An oven set to its lowest temperature with the door slightly open works perfectly well for small, occasional batches. A dehydrator becomes worthwhile if you dry food regularly, because it holds a steady low temperature, uses less power per batch and frees you from constant monitoring. Start with your oven, then upgrade once drying becomes a habit.

How long can I store dried beans and grains?

Dried beans and grains stored airtight in a cool, dark place keep for two to five years, and often longer with oxygen absorbers. Older beans take longer to cook but remain safe and nutritious. Watch for moisture, pests and any musty smell. Label and date every container so you can rotate your store and use the oldest first.

Ready to build a calm, capable pantry? Start with one tray of herbs this week, then explore our food storage basics to see how dried food fits a sensible, load-shedding-proof store. Less fear, more competence — one jar at a time.

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