Butterflied leg of lamb in an air fryer
Fresh — the short answer
250°C (482°F) for 20–24 min
- For
- 700g per piece, about 40mm at the thickest point, 1 pieces, From the fridge
- In
- Multicooker with air fry, single layer, pieces not touching
- Preheat
- Yes, before the food goes in
- Part way
- turn the pieces over at about 10 min
- Check
- A dark crust across the thickest part
- Safety
- Plug an air fryer directly into a wall socket. Do not run one from an extension lead. Full rule below.
Twenty to twenty-four minutes for a 700g piece — the largest single item charted here.
Fresh
The quick answer
250°C (482°F) for 20–24 min
Thickness across the opened joint, which varies enormously from one end to the other — the published range is that variation.
- Assuming
- 700g per piece, about 40mm at the thickest point, 1 pieces, From the fridge
- In
- Multicooker with air fry
- Loaded
- Single layer, pieces not touching
- Preheat
- Yes, before the food goes in
- Result
- Just cooked
Preparation
Opened out flat, seasoned, laid cut side down first.
How to load the basket
Single layer, pieces not touching. The reference condition. Air reaches every surface, and times are the shortest the food will achieve.
While it cooks
At about 10–12 minutes: Turn the pieces over
Both faces need the plate on a joint this thick.
How to tell it is done
- A dark crust across the thickest part
- The thin end is well done and the thick end still rosy, which is expected rather than a fault
Rest for 10 minutes before serving.
Where these figures came from — fresh
- Applies to
- Specific to this model
- Why this rating
- A published row from the manufacturer's grill chart, with the named temperature level converted to degrees using the table in the same manufacturer's instruction booklet. Both documents were read; neither figure is inferred.
- Last reviewed
- 2026-08-13
What this does not cover
- Published by the manufacturer for this appliance. It is evidence about this machine and is not general advice.
- This is a contact grill plate rather than a perforated basket. Heat reaches the food by conduction from the plate as well as by airflow, which is a different mechanism from air frying and transfers poorly to a basket machine.
Sources (1)
Ninja Foodi MAX Health Grill & Air Fryer AG551UK — Inspiration Guide and cooking charts (PDF)
SharkNinja Europe Limited — Manufacturer cooking chart (United Kingdom)
Relied on for: The temperature, time and quantity for butterflied lamb leg.
States this directly
Passage read and verified
Retrieved 2026-08-13 from argos-support.co.uk
Retrieved from Argos's manual library for Argos product 735/0124, published alongside the instruction booklet as a second document.
Chilled
No time or temperature for this, and not by accident
Butterflied leg of lamb is sold and cooked chilled, so the question is a real one. AirfryerHQ holds no published figure for it: not one of the manufacturer manuals read for this catalogue gives a chart row for this food in this state.
We are not going to produce one by adjusting the fresh figure above. A time arrived at that way would appear on this page looking exactly like a time somebody measured, and you would have no way to tell the difference.
What we do hold for butterflied leg of lamb: fresh. Those are a different question, not a starting point for this one.
Defrosted
No time or temperature for this, and not by accident
Butterflied leg of lamb is sold and cooked defrosted, so the question is a real one. AirfryerHQ holds no published figure for it: not one of the manufacturer manuals read for this catalogue gives a chart row for this food in this state.
Same reason as above: a figure adjusted from one we do hold would be indistinguishable from one somebody measured.
What we do hold for butterflied leg of lamb: fresh. Those are a different question, not a starting point for this one.
Marinated
No time or temperature for this, and not by accident
Butterflied leg of lamb is sold and cooked marinated, so the question is a real one. AirfryerHQ holds no published figure for it: not one of the manufacturer manuals read for this catalogue gives a chart row for this food in this state.
Same reason as above: a figure adjusted from one we do hold would be indistinguishable from one somebody measured.
What we do hold for butterflied leg of lamb: fresh. Those are a different question, not a starting point for this one.
Leftover (reheating)
No time or temperature for this, and not by accident
Butterflied leg of lamb is sold and cooked leftover (reheating), so the question is a real one. AirfryerHQ holds no published figure for it: not one of the manufacturer manuals read for this catalogue gives a chart row for this food in this state.
Same reason as above: a figure adjusted from one we do hold would be indistinguishable from one somebody measured.
What still governs, figure or no figure
Requirement — Food safety (microbiological)
Cool cooked food and get it into the fridge within one to two hours, keep the fridge between 0 and 5°C, and eat leftovers within 48 hours.
How to tell, without a thermometer
- There is no sensory test for this rule, and that is the point: food held too long at the wrong temperature does not necessarily look, smell or taste different
If it has not got there: Throw it away. This is the one rule in this catalogue where the remedy is not 'cook it longer', because cooking does not reverse it.
Important: Cooked rice is the sharpest case: Bacillus cereus toxins form at room temperature and survive reheating. Rice left out for more than an hour goes in the bin.
Requirement — Food safety (microbiological)
Reheat leftovers until steaming hot all the way through, and only reheat them once.
Target: 70°C in the thickest part, or an equivalent from the table below.
How to tell, without a thermometer
- Steam rising from the centre, not just the edges
- The middle is hot to the touch, tested after removing it from the appliance
If it has not got there: Keep going, and break dense food up or spread it out so the heat can reach the middle. If it will not heat through evenly, a microwave to get the centre hot followed by the air fryer to crisp the surface is a better tool for the job than the air fryer alone.
Important: Cooked rice and pasta left at room temperature can develop Bacillus cereus toxins that reheating does not destroy. If cooked rice has been out of the fridge for more than an hour, discard it rather than reheating it.
| Temperature | Held for | Measured at |
|---|---|---|
| 70°C | 2 min | the centre of the food |
| 75°C | 30 sec | the centre of the food |
What we do hold for butterflied leg of lamb: fresh. Those are a different question, not a starting point for this one.
What usually goes wrong
Wildly uneven doneness, which is inherent rather than a mistake. A butterflied leg is thick at one end and thin at the other by design, and the usual approach is to accept it and carve to preference rather than to try to even it out.
Running the appliance safely
These apply to every food and every air fryer, so they are here once rather than repeated under each state above. They come from Electrical Safety First, from UK product-safety notices and from the manufacturers’ own manuals.
- Plug an air fryer directly into a wall socket. Do not run one from an extension lead.
- An unusual smell, an unusual noise, or scorch marks on the plug mean stop using it and contact the manufacturer.
- Do not overfill. Food touching the heating element is a fire risk, not a cooking problem.
- White smoke from fatty food is usually normal. Black smoke means unplug it immediately.
- Do not leave an air fryer running unattended.
- Leave clear space above and around the appliance, and never cover the air intake or the outlet.
- Aim for a golden yellow colour or lighter on starchy foods such as chips and roast potatoes, rather than a darker brown.
- Buy from a reputable retailer rather than a third-party marketplace seller.
- Clean the drawer, the plate and the element after use. Accumulated grease is what smokes, and then what burns.
- Register the appliance with its manufacturer. It is how a recall reaches you.
- Do not rely on the appliance's own thermal protection. A UK recall was issued because it did not operate.
Each links to its own page, with what it means in practice, what to do if it has already happened, and the source it comes from. Every safety rule AirfryerHQ holds.
Why lamb behaves this way
Lamb carries a high proportion of hard external fat that needs sustained heat to render, and it renders faster in moving air than it does in an oven. That fat is both the appliance's advantage here and its problem: the same rendering that crisps the fat cap drips onto the chamber floor and is the commonest source of smoke in the whole catalogue. The meat itself is dense and small-grained, so it moves through its doneness range quickly and a chop goes from pink to grey in about two minutes.
Where to go from here
The pages that answer the questions this one tends to raise.
- Using a thermometer, and where to put itThe times above are for a piece that is not the one you are holding. This measures yours — and it is the single change that fixes most dry butterflied leg of lamb.
- How food actually gets crispyWhy patting it dry, spacing it out and a little oil are all the same instruction — so you can apply it when a page runs out.
- Reheating leftoversA different question governed by a different rule — steaming hot throughout, and only once.
- Why published timings differIf another chart says something else, this is usually why — and which one to believe.
Easily confused with
- Rack of lamb — A different cooking problem with a different answer.