
Air fryers are a quick and easy way to make a perfect lamb roast. The smaller space of an air fryer means less heat loss, so your roast lamb will cook faster than in a conventional oven. Air frying locks in flavour and ensures a juicy, tender roast with a lovely crust on the outside. You can even cook your roast potatoes and vegetables in the air fryer at the same time! The key to a successful air-fried roast lamb is to use a meat thermometer to check that the lamb is cooked to your liking.
| Characteristics | Values |
|---|---|
| Type of lamb | Boneless leg of lamb |
| Weight | 3-3.5 pounds |
| Seasoning | Salt, black pepper, rosemary, thyme, garlic |
| Cooking method | Air fryer |
| Temperature | 360°F |
| Cooking time | 30 minutes |
| Internal temperature | Medium: 70-75°C (157-167°F); Well-done: 75-80°C (167-176°F) |
| Resting time | 10 minutes |
| Sides | Potatoes, carrots, turnips, Greek salad |
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What You'll Learn

Cooking time and temperature
The cooking time and temperature for roast lamb in an air fryer will depend on several factors, including the size of the lamb joint, the weight of the lamb leg, the type of air fryer used, and your desired level of doneness. It is recommended to cook to temperature rather than time to achieve your desired results. A meat thermometer is the best way to ensure the lamb is cooked to your liking and is safe to eat.
As a rule of thumb, you can estimate about 15-20 minutes of cooking time per pound of lamb. However, it is important to periodically check the internal temperature of the lamb with a meat thermometer to gauge its doneness. The temperature should be measured at the thickest part of the roast, avoiding the bone.
For a medium level of doneness, aim for an internal temperature of 70-75°C (157-167°F). If you prefer your lamb well-done, cook it to an internal temperature of approximately 75-80°C (167-176°F). These guidelines are for the UK and may vary slightly in other countries.
When using an air fryer, it is important to preheat the appliance and let the lamb come to room temperature before cooking. This will impact how quickly your roast cooks. Additionally, the size and shape of the roast will also affect the cooking time.
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Seasoning and preparation
To prepare your lamb for roasting in the air fryer, first take the lamb out of the fridge for 15 to 30 minutes before cooking to allow it to come to room temperature. This will also help the meat cook more evenly.
For seasoning, a dry rub of salt, black pepper, rosemary, and thyme is a popular choice. You can also add garlic to the mix—either by mixing in garlic powder or stuffing the lamb with garlic slivers. Alternatively, you can use a Greek-style seasoning with dried oregano and a squeeze of lemon juice. If you're cooking your lamb with potatoes, you can season them with the same spices and a drizzle of olive oil.
If you're cooking a boneless leg of lamb, it's recommended to keep the netting on while it cooks to help it hold its shape. For bone-in lamb, be aware that it may take longer to cook.
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Using a meat thermometer
Take the lamb out of the fridge for 15–30 minutes before cooking to allow it to come to room temperature. Then, preheat your Air Fryer to 360°F for 5 minutes.
When checking the temperature of the lamb, insert the probe into the thickest part of the joint, avoiding any bones. The temperature guidelines provided here are for the UK and may vary slightly in other countries. For medium-rare lamb, the internal temperature should be 54°C (129°F). For medium, the internal temperature should be 70–75°C (157–167°F). For well-done, the internal temperature should be 75–80°C (167–176°F).
If you are cooking with a bone-in leg of lamb, it might take longer to cook.
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Cooking with potatoes
Cooking roast lamb with potatoes in an air fryer is a quick and easy way to make a delicious meal. The air fryer seals in flavour and cooks the lamb to tender, juicy perfection in a fraction of the time it would take in a traditional oven.
Preparing the Potatoes
Cut your potatoes into thick wedges or chunks. Place them in a bowl and drizzle with olive oil. For six medium potatoes, you will need about one tablespoon of olive oil. Toss the potatoes to combine, ensuring they are evenly coated. Season with salt and pepper, and dried oregano. For six potatoes, use about one teaspoon each of salt and pepper, and one teaspoon of dried oregano. You can also add a squeeze of lemon juice and garlic granules for extra flavour.
Cooking the Potatoes
Arrange the seasoned potato wedges in a single layer in the air fryer basket. For extra crispy potatoes, ensure they are in a single layer and not overlapping. Set the air fryer to 360°F / 180°C and cook for 30 minutes or until golden brown and crispy. If you are cooking the potatoes alongside the lamb, follow the timings and temperatures provided below for the lamb.
Checking the Potatoes are Cooked
After removing the lamb, check that the potatoes are cooked through by piercing them with a knife. If they need a little longer, return them to the air fryer for a few minutes.
Preparing the Lamb
Take the lamb out of the fridge 30 minutes before cooking to allow it to come to room temperature. This helps the lamb cook more quickly and evenly. Make small incisions all over the lamb using a sharp knife. In a small bowl, mix together minced garlic, chopped rosemary, thyme, olive oil, salt, and pepper. You can also add other spices and herbs such as cumin, coriander, mustard powder, onion powder, and chili powder. Rub this mixture all over the lamb, ensuring it gets into the incisions.
Cooking the Lamb
Place the seasoned lamb in the air fryer basket, nestling it among the potatoes. Set the air fryer to 360°F / 180°C. For medium-rare lamb, cook for 25-30 minutes. For medium lamb, cook until the internal temperature reaches 70-75°C (157-167°F). For well-done lamb, cook until the internal temperature reaches 75-80°C (167-176°F). Check the temperature with a meat thermometer to ensure the lamb is cooked to your liking.
Resting and Serving
Once cooked, remove the lamb and potatoes from the air fryer. Let the lamb rest for about 10 minutes before carving. This allows the juices to redistribute. Collect any juices released during resting and drizzle them over the lamb when serving. Serve the roast lamb with the crispy potatoes alongside. You can also make a simple gravy using the pan drippings. Deglaze the air fryer basket with a little water or broth, transfer the liquid to a saucepan, and thicken with a cornstarch slurry.
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Boneless vs bone-in lamb
When it comes to cooking roast lamb in an air fryer, there are a few things to consider when deciding between using boneless or bone-in lamb. Both options have their advantages and will result in delicious, tender, and juicy lamb when cooked correctly.
Boneless lamb legs are a great option if you are looking for convenience. They are typically available in most grocery stores and butcher shops, either fresh or frozen. This cut of meat is easy to cook and can be prepared with just a few simple ingredients. The cooking time is generally faster than bone-in lamb, and it is a good option if you are looking for a smaller joint. Boneless lamb legs are also a good choice if presentation is important to you, as they can look impressive on the table.
On the other hand, bone-in lamb has the advantage of being extra flavorful. The bone adds depth of flavor to the meat, and it is a great option if you want to make a hearty roast for a holiday or weekend dinner. Bone-in lamb legs are typically larger, weighing anywhere from 5 to 7 pounds, and can serve up to 12 people. While the bone-in option may take longer to cook, the result is tender and juicy lamb that is well worth the wait.
To ensure your roast lamb is cooked to your desired doneness, it is recommended to use a digital meat thermometer. The perfect lamb roast should have an internal temperature of 130°F for blushing pink meat or 175°F for very tender meat that falls apart. Remember to let the lamb rest for at least 15 minutes before serving, as the internal temperature will continue to rise during this time.
Whether you choose boneless or bone-in lamb, the key to a successful roast in an air fryer is to season the lamb generously and cook it until it reaches your desired level of doneness. The air fryer will lock in the flavor and moisture, resulting in a delicious and juicy roast that is perfect for any occasion.
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