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Dried tomato slices in an air fryer

Fresh — the short answer

60°C (140°F) for 360–480 min

For
about 3mm at the thickest point
In
Dual-basket air fryer
Published for
Ninja Foodi Dual Zone AF300UK
Preheat
Not needed
Check
Brittle at the edges and no longer tacky at the centre
Moderate confidenceWell supported, but from a narrower base of sources than we would like.

Fresh tomato in 3mm slices gets six to eight hours at 60°C in one manufacturer's chart, with a note about steaming them first.

Manufacturer figures with no state given — 1 from a named machine, listed further down this page.

Fresh

The quick answer

60°C (140°F) for 360–480 min

Published range of six to eight hours for 3mm slices, or grated. The chart prints no amount.

Assuming
about 3mm at the thickest point
In
Dual-basket air fryer
Published for
Ninja Foodi Dual Zone AF300UK
Preheat
Not needed
Result
Cooked but dry
Moderate confidenceWell supported, but from a narrower base of sources than we would like.

Preparation

Cut in 3mm slices or grated, as the row prints. It adds to steam them if planning to rehydrate.

How to tell it is done

  • Brittle at the edges and no longer tacky at the centre
  • Snaps or tears cleanly rather than bending
  • No cool, damp patch in the middle of a slice when it is torn

Where these figures came from — fresh

Moderate confidenceWell supported, but from a narrower base of sources than we would like.
Applies to
Specific to this model
Why this rating
A published dehydrating row from the manufacturer's own Quick Start Guide for this machine, under a block headed fresh. The chart has no amount column, so the slice a row prints is the only measure it gives.
Last reviewed
2026-10-10

What this does not cover

  • Published by the manufacturer for this model. It is evidence about this appliance and is not general advice.
  • This machine has two drawers. The chart prints one amount for the row and does not say which drawer it is for, or whether it is for one drawer or both.
  • The chart heads this block Fresh Fruits & Vegetables, and the row is held as fresh on that heading. The word is the block's and not the row's own.
Sources (1)

  • Ninja Foodi Dual Zone Air Fryer AF300UK — Quick Start Guide and cooking charts

    SharkNinja Operating LLC — Manufacturer cooking chart (United Kingdom)

    Relied on for: The state, amount, temperature and time for tomato slices dried.

    States this directly

    Passage read and verified

    Retrieved 2026-10-10 from euronics.a.bigcontent.io

    Retrieved from a retailer's document store, Euronics, which mirrors the manufacturer's booklet. Argos's manual library holds an earlier revision of the same guide, 200515_Mv1, which differs in a few printed amounts; the later revision is the one held here.

Chilled

Cooked as fresh: use the fresh figures above. Raw food sold chilled is the fresh state under another name, and the charts those figures come from start from fridge-cold.

Manufacturer figures with no state given

This is a published figure for one named machine. The manufacturer does not say whether this is fresh or frozen. So it is kept apart from the figures above, and not used as the answer for any of them.

  • Ninja Foodi MAX Health Grill & Air Fryer AG551UK: 60°C for 360–480 min

    Published range of six to eight hours for 3mm slices, or grated. The chart prints no amount.

What usually goes wrong

Slices that go mouldy in the jar. Tomato is acidic and very wet, and any part of a slice left pliable holds enough water to spoil the batch — which is why they must be brittle rather than merely dry.

Running the appliance safely

The rules for the machine are the same whatever is in it: plug it straight into a wall socket, leave clear space round it, do not overfill it, do not leave it running unattended, and unplug it at black smoke or an electrical smell. They are set out once, each with its source and what to do if it has already happened, and not repeated on every food. Every rule for running an air fryer safely.

Tomatoes in fast-moving hot air

A whole cherry tomato is a sealed bag of liquid behind a skin that resists heat until it splits, so the job is to blister the skin before it bursts. A halved tomato is an open cut face full of water and sugar, and the job is the opposite: drive off water slowly enough to concentrate the sugars without scorching the exposed flesh, which is why the published temperature drops by thirty degrees. Tomatoes also flood a small chamber with steam, which is worth knowing before putting them in alongside anything meant to be crisp.

More on tomatoes

Where to go from here

The pages that answer the questions this one tends to raise.

Easily confused with