Dehydrated Strawberries

Doneness

Slices have shrunk to about half their original size, edges have curled up into crisp little cups, and a snapped piece breaks cleanly with no flex or bend. The colour has deepened from bright red to a darker concentrated red. Any slice that still feels bendy or has a soft moist patch at the centre needs another 20–30 minutes — half-dried strawberries spoil quickly in storage, so don't pull them early.

Oil & seasoning

No oil — this is a dehydration cook, not a Maillard cook. Adding oil at any stage stops the water evaporating from the cut surface and the slices end up gummy instead of crisp. Skip the oil spray and skip the pre-cook sugar dust as well.

Season with: light dust of confectioners sugar AFTER the cook (optional), cinnamon AFTER the cook, a pinch of citric acid AFTER the cook for tart-candy brightness, freeze-dried-strawberry powder to amplify the strawberry flavour, dark chocolate drizzle once fully cool (turns the crisps into a snack treat).

Watch out for

• !Slice 3 mm (⅛ inch) thin and uniform. Thicker slices (¼ inch+) stay gummy at the centre after the full 3 hours and the surface darkens before the middle dries. Use a mandoline or a sharp paring knife with a steady pace — every slice the same thickness or the thin ones burn while the thick ones stay wet.
• !Single layer non-negotiable. Overlapping slices steam each other instead of dehydrating — the bottom slice ends up gummy and the top slice scorches. Cook in two or three batches if needed; the cook is long enough that splitting it doesn't add real wall-clock if you stagger the loads.
• !Check the air fryer goes down to 200 °F first. Some older basket-style air fryers have a 250 °F or 300 °F minimum — at 250 °F the strawberries caramelise to bitter-black before the water evaporates and the crisp turns to scorched candy. Cosori, Ninja Foodi, Instant Vortex Plus and most current dehydrate-capable models go to 175–200 °F; check the brand panel below if unsure.
• !Don't pull at 150 minutes thinking they're done. The slices LOOK done at 2.5 hours — shrunk and dark — but a slice snapped open will still show a moist red centre. The full 180 minutes (with a flip at 90 to keep them from sticking to the basket grate) gets the centre fully dry. Under-dried strawberries grow mould in storage within a week.