Learn how to roast perfect Roasted Boneless Leg of Lamb Recipe every time! Herb crusted and garlic stuffed, this is an easy lamb roast anyone can make!
We also have this bone-in leg of lamb recipe.
Why You’ll Love This Recipe
My favorite way to celebrate anything is with this roasted boneless leg of lamb because it’s so easy to do but looks grande on the table!
I have been making this lamb roast recipe for Easter dinner, Holidays or whenever I need to leave a lasting impression for the past 20 years. Works every time!
- Easy recipe: Lamb is expensive, so I understand your fear of “screwing it up”. You will not thanks to my foolproof roasting method!
- Tender juicy meat: Thanks to the precise cooking times for your preferred level of doneness.
- For garlic all lovers: This boneless leg of lamb roast is stuffed with over 30 slivers of fresh garlic.
- Recipe with a video: If you are more of a visual learner, there is a video.
Reader’s Review
I’ve used this recipe multiple times for Christmas dinner and my husband always raves over the lamb when he’s normally not a huge fan of it! Using the fat droppings for roasted potatoes was also a wonderful tip! Thank you for this recipe.
Janice Luong
Ingredients for Roasted Boneless Leg of Lamb
You will need only 6 simple ingredients. General rule of thumb is to plan about 1/2 pound of roasted lamb per person.
- Boneless leg of lamb: It is a leg of lamb where bone has been removed and meat rolled, tied or netted into a shape of oval roast. You can find it in many grocery stores fresh or frozen, or in a butcher shop.
- Garlic: Fresh garlic cloves make all the difference. I don’t recommend to use garlic powder.
- Dried rosemary: Dried rosemary is more convenient. However, you can use fresh rosemary if you wish and it will yield even more flavor.
- Olive oil: Extra virgin olive oil goes well with lamb naturally. But you can also use avocado oil or grapeseed oil.
- Salt and black pepper: To season and taste.
How to Roast a Boneless Leg of Lamb
- Prep: Preheat oven to 425 degrees F while you are preparing the roast. Cut garlic into thin slivers.
- Make slits in the roast: In a medium roasting pan or Dutch oven (no need for a wire rack but you can use one), place boneless lamb roast and make about 20-30 inserts with a paring knife.
- Stuff with garlic: Stick garlic slice into each opening until you run out of garlic.
- Season with spices on both sides: Rub the roast with oil all around. Then sprinkle one side with half of rosemary, salt and pepper. Turn around and repeat on another side.
Fat Tip
Fat side up or down? Like with any roast, the best practice is to cook meat with fat side up, so it keeps it moist and juices locked in inside. It acts like a blanket.
Bake lamb roast uncovered according the schedule below until desired doneness when checked with a quality meat thermometer.
Meat will keep “cooking” as it rests. Please keep in mind internal temperature will rise while meat is resting after baking in the oven.
- Let meat rest: Remove lamb roast from the oven and let rest uncovered for 15 minutes. Do not skip!
- Remove casing: Transfer lamb roast on a cutting board. Using a sharp carving knife, remove the casing. I highly recommend to sharpen the knife before slicing, helps a lot not to destroy the roast.
- Carving roast: Slice into 1/4-inch slices against the grain. Thin slices of lamb taste better than thick slices.
How Long to Cook Boneless Leg of Lamb?
All ovens vary due to age, electric vs. gas etc. Not to mention convection oven cooks food faster. So check on your boneless leg of lamb roast earlier than later!
My best advice is for 4-5 pounds roast to check internal temperature after 1 hour and go from there. For 2-3 pounds roast, check after 45 minutes. It all comes down to checking often after a certain period of time.
| Desired lamb doneness | Internal Temperature | Time |
|---|---|---|
| Medium rare | 130F – 135F | 16 minutes/lb |
| Medium well | 140F – 145F | 18 minutes/lb |
| Well done | 150F – 155F | 20 minutes/lb |
Tips for Best Results
- Plan ahead: Just make sure you understand your dinner will be on the table in 2 hours if you roast lamb. I speak from my own experience.
- Don’t remove the casing before cooking: Under any circumstances keep netting or rope on. It is what is holding pieces of meat together. If you remove it, meat will fall apart.
- Bake roast uncovered: You need meat to brown on the outside, not steam. If you cover it with a lid or aluminum foil, roast will steam instead of roasting.
- Adjust for your oven: All ovens vary, I can’t stress this enough! If your oven runs hotter or takes longer to cook, adjust cook time accordingly to avoid overcooked or undercooked lamb. Rule of thumb is to start checking with instant-read thermometer 1/2 hour before end of cook time as per recipe.
- If you use a convection oven method: It cooks food faster than regular oven. I recommend to reduce the temperature by 25 degrees F.
To Roast Potatoes in Fat Drippings
This step is optional. Lamb is extremely fatty meat, you will see a lot of fat and pan drippings at the bottom of roasting pan. Take advantage of it to make lamb and potatoes (and other veggies), so good!
- Remove some fat and drippings: Scoop out 1 cup of drippings as it is just too much and roasted vegetables will come out too greasy.
- Add veggies and seasonings: I added about 2 pounds baby potatoes, 2 carrots, 1/2 tablespoon garlic powder, 3/4 tsp salt and ground black pepper to taste. Then stir to coat.
- Bake lamb: At 450 degrees F for about 35 minutes or until fork tender. You can prep the veggies and seasonings while lamb is cooking, so after just pop them in without even turning off the oven.
Serving Ideas
Serve sliced roasted boneless leg of lamb on its own, or drizzled with freshly squeezed lemon juice or fresh mint jelly. We usually have lemon on hand at all times, so it rounds up meat flavors nicely.
- Sauces: Aside mint jelly and traditional gravy, chimichurri sauce adds bright tangy flavor to roasted lamb.
- Potatoes: Lamb roast would be delicious with mashed potatoes, sweet potato mash, crispy Parmesan potatoes or this genius cauliflower mashed potatoes.
- Salads: Look for salads that are bright and colorful like spinach avocado salad, tomato cucumber feta salad or this spinach salad recipe.
- Vegetables: Garlic green beans and baked asparagus are just classics.
How to Store
Store: Refrigerate lamb leftovers whole as a roast or sliced in an airtight container for up to 5 days. It tastes so good cold!
Freeze: Freeze leftover lamb sliced or cut into bite sized pieces in an airtight container for up to 3 months. Thaw in the fridge and then use as a protein in a salad for lunch or sandwich on-the-go.
FAQs
Yes, you can stuff and season roast, cover and refrigerate for 24 hours. Then let it come to room temperature and roast as per recipe.
This leg of lamb recipe should be cooked uncovered.
Yes, you can cook 2 lamb roasts at same time if both of them fit into your Dutch oven or roasting pan in a single layer. Also you can use 2 separate Dutch ovens at same time as long as they fit on the same bottom shelf of your oven.
More Lamb Recipes to Try
- Braised lamb shanks
- Lamb stew
- Pan seared lamb chops
- Air fryer lamb chops
- Lamb loin chops
- Grilled lamb kofta kebabs
More Roast Recipes to Try
Roasted Boneless Leg of Lamb
Equipment
Video
Ingredients
Boneless Leg of Lamb Roast
- 4-5 pounds boneless leg of lamb
- 5-7 large garlic cloves, cut into slivers
- 2 tablespoons olive oil, extra virgin
- 2 tablespoons rosemary, dried
- 1 1/4 teaspoons salt
- Ground black pepper, to taste
Roasted Potatoes After (Optional)
- 2 pounds potatoes, cubed
- 2 large carrots, sliced
- 1/2 tablespoon garlic powder
- 3/4 teaspoon salt
- Ground black pepper
Instructions
- Preheat oven to 425 degrees F.
- In a medium roasting pan or Dutch oven, place boneless leg of lamb roast and make 20-30 inserts with a paring knife. Stick garlic slice into each opening until you run out of garlic.
- Rub roast with oil all around. Then sprinkle one side with half of rosemary, salt and pepper. Turn around and repeat on another side.
- Bake uncovered according until desired doneness. Remember meat will keep "cooking" as it rests.°Medium Rare: 130 – 135 degrees F internal temperature – about 16 minutes/lb.°Medium Well: 140 – 145 F internal temperature – about 18 minutes/lb.°Well-Done: 150 – 155 F internal temperature – about 20 minutes/lb.
- My best advice for 4-5 lbs roast is to check internal temperature after 1 hour and go from there. For 2-3 lbs roast, check after 45 minutes. It all comes down to checking often after a certain period of time towards the end.
- Remove lamb roast from the oven and let rest uncovered for 15 minutes.
- Using a sharp knife, remove the casing and discard it.
- Slice lamb into 1/4 inch slices against the grain. Serve warm at a celebration table or use cold leftovers in sandwiches or salads.
Roast Potatoes in Fat Drippings (Optional)
- Scoop out 1 cup of fat and drippings from the pan and leave in the rest.
- Add potatoes, carrots, garlic powder, salt and pepper and stir well.
- Bake at 450 degrees F for about 35 minutes or until fork tender. You can prep the veggies and seasonings while lamb is cooking, so after just pop them in without even turning off the oven.
Notes
- Make ahead: To save time during a busy day of cooking of a holiday, you can stuff and season roast, cover and refrigerate for 24 hours. Then let it come to room temperature and roast as per recipe.
- Store: Refrigerate roast whole or sliced in an airtight container for up to 5 days. It tastes so good cold.
- Freeze: Freeze leftovers sliced or cut into bite sized pieces in an airtight container for up to 3 months. Thaw in refrigerator.
- Don’t remove the casing before cooking: Under any circumstances keep netting or rope on. It is what is holding pieces of meat together. If you remove it, meat will fall apart.
- Adjust for your oven: All ovens vary. Rule of thumb is to start checking with internal meat thermometer 1/2 hour before end of cook time as per recipe.
- Meat will keep “cooking” as it rests: Please keep in mind internal temperature will rise while meat is resting after baking in the oven.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
I made this during my first ever Xmas 2021 dinner that I cooked and my fiancé was blown away!! This recipe was so easy to follow and it came out like I’ve been cooking lamb for years. Some tips: I cooked it until the internal temperature was about 125F and wrapped it in foil and kept it in the microwave while I was busy prepping the roasted veggies using the fat drippings (which turned out fantastic). The temperature ended up rising up to 140F while resting, so if you like it on the rare side, take it out of the oven sooner! This receipt will forever be a staple in my home every holiday.
So happy to hear that it is a staple!
I put the potatoes and carrots beneath while the lamb roasted, and they came out great. Next time I’ll add chunks of onion too. Great recipe.
So happy you enjoyed it!
This came out perfectly! We loved it so much and it was so easy to do.
Happy to hear!
I love how you have written this recipe. It’s clear and so understandable..thanks.. I have roasted lamb in my oven many times but this time I have to use my air fryer or bbq for the boneless leg of lamb…
Do you have any advise or recipes for air frying or bbq’ing my boneless leg of lamb. My oven will be used for the Turkey…
I look forward to your response.
Note…..I cannot control the temp on my bbq
Cathy
I have not tried either. You would have to play it by ear. I only made air fryer lamb chops. You can if the roast fits in your air fryer and again just estimate. 400F. Good luck!
I’m making this delicious sounding lamb roast for Easter. I purchased 2, 3.5-4 lbs
each. How do I time the cooking. Would it be about 1 hrs. Or 2.
Hi Luanne. Select your preferred level of doneness and calculate how many mins per lb per one roast. You don’t double the cook time for 2 roasts, still the same as per one when cooking both at once. Just check and play it by ear and see if they need a few extra minutes because it’s 2 of them. Hope this helps.
Also make sure they are not touching each other or are in separate baking vessels.
I am a little confused about when to roast the potatoes? If you wait until the lamb is cooked and you rest it for 15 minutes but it takes 35 minutes to cook the potatoes won’t the lamb be cold? Please reply as I want to make this delicious lamb very soon
Yes the lamb will cool slightly, feel free to cover it after it rests to stay warmer, but if you are worried about that feel free to roast your vegetables separately.
I followed yr recipe and WOW it came out incredible…It had been awhile since I cooked lamb and was a little skeptical so followed you to a T and I will be a faithful follower
Thanks so much Linda
Yeah! So happy for you Linda, thanks for being here and glad it turned out so well. 🙂
Can I make gravy with the juices ?
Sure!
This was incredible! Had to keep my 4 pound roast in the oven for about 1.25 hours to get the center to 135. It was worth the wait, foolproof and delicious. Didn’t have much liquid left for the vegetables so I needed to add some additional olive oil. Will definitely make again
So glad you loved it!
This looks so easy and yummy! I am curious though…most roast recipe instructions include an initial searing of the meat on a high temp (425-450) for 15 minutes and then turning down the oven to 350 for the remainder of the cooking time. Your recipe keeps it at the high temp for the entire time. Doesn’t this burn the outside or simply reduce the cooking time? Thanks for feedback.
Follow the recipe as is, it has been tested multiple times, and you will have amazing leg of lamb roast.