Method by food
- Anything crisp — chips, roast potatoes, fried food, pizza
- Hot oven or air fryer, 200°C, on a rack or straight on a hot tray. Never a microwave, which drives water back into the surface.
- Roast meat
- Sliced, in a covered dish with a splash of stock, in a moderate oven. Or, better, do not reheat it — serve it cold or in a sandwich.
- Stews, curries, ragùs
- A pan on a low heat with a splash of liquid, stirred. These genuinely improve overnight.
- Rice and pasta
- A pan with a splash of water and a lid, or a microwave with a damp cover. Both work.
- Soup
- A pan. Add liquid — it thickens overnight.
- Pastry and bread
- Oven, uncovered. A microwave makes pastry soft and bread leathery within seconds.
- Egg dishes and delicate fish
- Very gently, or not at all. Both toughen fast.
Why the microwave ruins crisp things
A microwave heats water directly throughout the food. That is efficient, and it means steam is generated inside and travels outward to the surface, where it condenses. So the surface gets wetter as the food heats — the exact opposite of what a crisp crust needs.
An oven does the reverse: it heats from the outside, driving moisture away from the surface, so a crust re-crisps. An air fryer does the same thing faster because it moves air aggressively.
This is why reheated pizza in a microwave is soft and reheated pizza in a pan or oven is not, and it is the single most useful thing to know about leftovers.
Making leftovers better than a reheat
- Fry them. Leftover roast potatoes, vegetables and greens all become better food in a hot pan than they were originally. Bubble and squeak is the principle at its best.
- Turn rice into fried rice. Cold, dry rice is what fried rice actually requires — freshly cooked rice is too wet.
- Turn roast meat into a sandwich, a hash, a ragù or a soup, rather than reheating slices.
- Turn stale bread into breadcrumbs, croutons, panzanella, French toast or a soup thickener.
- Blend leftover roast vegetables into a soup with stock. It takes five minutes and tastes deliberate.
- Add something fresh. Reheated food has lost its volatile aromas — herbs, lemon, raw onion, chilli or good oil put back what heating took away.
The safety rules
- Cool leftovers quickly and refrigerate them promptly rather than leaving them out to cool for hours.
- Reheat until piping hot throughout, not just warm at the edges. Stir partway through, especially in a microwave, which heats unevenly.
- Reheat once only.
- Rice needs particular care — cool it fast, refrigerate promptly, and use it within a day.
- Follow the Food Standards Agency for keeping times, temperatures and anything involving rice, poultry or reheating cooked meat. FoodHQ does not publish those figures, and this is a case where the authority is worth reading directly.
Common questions
Is it true you should not reheat rice?
You can reheat rice once, provided it was cooled quickly and refrigerated promptly. The risk comes from rice left at room temperature, not from reheating as such. Follow FSA guidance.
Why does reheated food taste different?
The most volatile aroma compounds went the first time, and fats oxidise in the fridge. Adding something fresh at the end compensates considerably.
Can I reheat in a slow cooker?
No. It heats too slowly and holds food in the range where bacteria multiply. Reheat on the hob or in the oven.
Should I cover food when reheating?
Cover wet things to keep moisture in; leave crisp things uncovered so moisture can leave.
Try this next
- Moisture migration why the microwave softens things
- How to freeze food well the other half
- Microwaving how it actually heats
- Air fryer the best reheating tool