by Olena

Boneless Leg of Lamb Roast

Olena Osipov
4.9 from 42 votes

How to cook perfect Boneless Leg of Lamb Roast every time. Herb crusted and garlic stuffed, this is easy roast lamb recipe anyone can make!

boneless leg of lamb roast in a dutch oven

Boneless Leg of Lamb Recipe

You might not be aware yet. To roast boneless leg of lamb is my favourite way to celebrate anything. I love cooking deboned lamb because it’s so EASY but looks GRANDE on the table. Yes, it is super simple and hard to mess up.

I created this basic boneless leg of lamb recipe about 15 years ago. And I make it for a special occasion or when I need to leave a lasting impression. Works every time.

Last time was my visiting mom that “doesn’t like” lamb. And a time before I made this roast to say “thank you” to the nicest plumber on Earth. Everyone loves it! And I will teach you how to cook the most perfect boneless leg of lamb in the oven. For Holidays, Easter or a weekend dinner. You can do it!!!

Buying Best Lamb

Lamb is expensive. Like any red meat, like any meat. So I understand your fear of “screwing it up”. You will not. Boneless lamb is actually the easiest meat to roast. I just learnt how to make pot roast in Instant Pot. I still don’t know how to cook a prime rib.

When it comes to buying lamb I turn to Costco. Kirkland boneless leg of lamb from Costco does it for us. The cost is about $8 per pound. And 99% of lamb sold in Canada I ever saw is from Australia.

boneless lamb roast, olive il, garlic, rosemary, salt and pepper

Bone In Vs. Boneless Leg of Lamb

I prefer and highly recommend to use boneless leg of lamb for many reasons:

  • It is easy to fit into a roasting pan.
  • It is easy to carve.
  • You get more meat.
  • And it probably cooks faster.

How Long to Cook Boneless Leg of Lamb?

How long do you cook a boneless leg of lamb? Cooking time depends on how you like your meat. Just like with steak.

Below are listed cooking times per pound.

  • Medium Rare: 130 – 135 degrees F internal temperature – about 16 minutes per pound.
  • Medium Well: 140 – 145 F internal temperature – about 18 minutes per pound.
  • Well-Done: 150 – 155 F internal temperature – about 20 minutes per pound.

It all comes down to checking often after a certain period of time. My best advice is:

  • For 4-5 lbs roast: Check after 1 hour for internal temperature with a meat thermometer and go from there.
  • For 2-3 lbs roast: Check after 45 minutes.

More Tips for Cooking Time:

  • Check often: The key is to check often towards the end with an internal meat thermometer.
  • All ovens vary: Age, electric vs. gas. Not to mention convection oven cooks food faster. So check earlier than later!
  • Meat will keep “cooking” as it rests: Please keep in mind internal temperature will rise while meat is resting after baking in the oven.
  • Bake uncovered: You need meat to brown on the outside, not steam.

What Temperature?

I know there is a slow roasted lamb cooking method at low 300 degrees F temperatures. My boneless lamb roast is baked at 425 degrees F. I think it yields juicy meat inside with browned outside within a reasonable amount of time.

Below is lamb cooked for 18 minutes/lb which ended up medium well after resting.

steamy boneless lamb roast sliced on a cutting board

How to Cook Boneless Leg of Lamb

1. Season with Rosemary and Garlic

  • Prep: Preheat oven to 425 degrees F while you are preparing the roast. Cut garlic into thin slivers.
  • Make holes in the roast: In a medium roasting pan or Dutch oven, place deboned leg of lamb roast and make 15 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 roast with oil all around. Then sprinkle one side with half of rosemary, salt and pepper. Turn around and repeat on another side.

2. Bake Uncovered

Bake uncovered according until desired doneness.

  • Medium Rare: 130 F to 135 F (about 16 minutes per pound)
  • Medium Well: 135 F to 140 F (about 18 minutes per pound)
  • Well-Done: 155 F to 165 F (about 20 minutes per pound)

My best advice is for 4-5 lbs roast 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.

3. Let Rest and Carve

  • Important to let meat rest: Remove lamb roast from the oven and let rest uncovered for 15 minutes. Do not skip!
  • Remove casing: Transfer 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 ones.

how to cook boneless leg of lamb step by step

FAQs and More Tips

  • Do I have to marinate the lamb? No. Lamb is tender meat. You just need to season it properly. My absolute favourite classic seasonings are garlic and rosemary. Maybe a squeeze of lemon at the end. So, no lamb marinade recipe to follow. Yay for simplicity.
  • Can I use boneless lamb shoulder? Yes. I have done it many times. It depends what’s at the store when I’m there. Simple as that. I believe boneless lamb shoulder is even cheaper than the leg.
  • Can I use fresh rosemary instead of dried? Yes. I use both fresh and dried rosemary with this recipe. One time I bought a bunch of fresh rosemary for making boneless turkey breast roast. It lasted a month in the fridge. Long enough for “the super nice plumber” dinner. But not long enough for “not liking lamb mom” dinner. So I have tried both many times.
  • What to do with all that fat? Lamb is extremely fatty meat. You will see a lot of fat solidify at the bottom of the roasting pan pretty much immediately as it starts to cool off. And if you refrigerate leftovers, fat will solidify nicely into white chunks. I take this as an opportunity to discard extra fat and remove it before serving or reheating.
  • Plan ahead: Cooking boneless leg of lamb in the oven IS easy! It just needs enough cooking time. In our days of sheet pan/one pot dinners and Instant Pot, I recommend to plan ahead with this recipe. 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. I was “caught off guard” a bit once last month.:) We ended up drinking a lot of wine and beer with a super nice plumber guy. It was a pleasure anyways.

Storing and Serving Suggestions

Storing leftovers: Refrigerate roast whole or sliced in an airtight container for up to 5 days. It tastes so good cold.

More Lamb Recipes

boneless lamb roast

Boneless Leg of Lamb Roast {Easy Recipe!}

How to cook perfect Boneless Leg of Lamb Roast every time. Herb crusted and garlic stuffed, this is easy roast lamb recipe anyone can make!
4.91 from 42 votes
Print Save Rate
Course: Dinner
Cuisine: American Ukrainian
Prep Time: 10 minutes
Cook Time: 1 hour 30 minutes
Total Time: 1 hour 40 minutes
Servings: 10
Calories: 175kcal
Author: Olena Osipov

Ingredients

  • 4-5 lbs boneless leg of lamb
  • 5-7 large garlic cloves cut into slivers
  • 2 tbsp olive oil extra virgin
  • 2 tbsp rosemary dried
  • 1 1/4 tsp salt
  • Ground black pepper to taste

Instructions

  • Preheat oven to 425 degrees F. In a medium roasting pan or Dutch oven, place boneless leg of lamb roast and make 15 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 slice into 1/4 inch slices against the grain. Serve warm at a celebration table or use cold leftovers in sandwiches or salads.

Storing leftovers: Refrigerate roast whole or sliced in an airtight container for up to 5 days. It tastes so good cold.

    Video

    Notes

    • All ovens vary: Age, electric vs. gas. Not to mention convection oven cooks food faster. So check earlier than later!
    • Meat will keep "cooking" as it rests: Please keep in mind internal temperature will rise while meat is resting after baking in the oven.
    • Bake uncovered: You need meat to brown on the outside, not steam.
    • Do I have to marinate the lamb? No. Lamb is tender meat. You just need to season it properly.
    • Can I use boneless lamb shoulder? Yes. No changes.
    • Can I use fresh rosemary instead of dried? Yes.
    • What to do with all that fat? Lamb is extremely fatty meat. You will see a lot of fat solidify at the bottom of the roasting pan pretty much immediately as it starts to cool off. And if you refrigerate leftovers, fat will solidify nicely into white chunks. I take this as an opportunity to discard extra fat and remove it before serving or reheating.
    • Plan ahead: I recommend to plan ahead with this recipe. 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.
    • Make sure your knife is sharp: I highly recommend to sharpen carving knife right before slicing, to avoid "destroying" the roast.

    Nutrition

    Calories: 175kcal | Carbohydrates: 1g | Protein: 24g | Fat: 8g | Saturated Fat: 2g | Cholesterol: 73mg | Sodium: 362mg | Potassium: 343mg | Fiber: 1g | Sugar: 1g | Vitamin A: 21IU | Vitamin C: 1mg | Calcium: 18mg | Iron: 2mg
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    olena osipov in the studio

    Hello and welcome to iFOODreal.

    My name is Olena Osipov. I'm a mom to 2 boys, a wife to Alex and we reside on magical Vancouver Island in British Columbia, Canada. This is our healthy family recipes blog. Originally from Ukraine, I grew up on real food. As an adult, I struggled with diets for years because none worked long-term. Now for over 10 years, I cook easy healthy meals for my family. I can help you with “What’s for dinner?” too.

    100 comments on “Boneless Leg of Lamb Roast

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    1. 5 stars
      Very easy recipe. I use this recipe every time I cook leg of lamb. I smother with garlic sauce. 5 star leg of lamb.
      Thank you

    2. 5 stars
      Delicious and tender and juicy. Prepared and baked according to your directions, minus the salt. Leftovers, not many;) are going in a pot pie tomorrow!

    3. 5 stars
      Tried this recipe for our Christmas dinner and it turned out fantastic! We threw some carrots cut into thirds and quartered yellow potatoes in with the lamb to make it a full meal (add them for the last 40-50 mins of cook time).
      At the end, I made a roux from butter and flour on the stovetop and whisked in the pan juices to make a gravy. Delicious!

    4. 5 stars
      Suggestion .. cut potatoes and enjoy the crispy flavor of fat on those roasted potatoes! Don’t forget your mint jelly, too! Happy New Year

    5. This looks fantastic, can’t wait to try! one question, in the blog area you say 12 min/lb for med rare but in the recipe below you say 16 min/lb?
      Thanks!

    6. 5 stars
      Thank you for the reminder about roasted lamb. Your recipe is a great one and made our holiday menu so much better.

    7. An important thing that is missing, it appears you cooked the leg while in the elastic netting, did this cause any issue. No where is it stated on the Costco package, or in recipes about that netting. Any discussion about tying the roast is done with kitchen cotton twine. You picture appears to indicate you cooked it with the netting.

    8. 5 stars
      I had a college friend named George Osipov in 1958. I believe he was from Russia. Any relation? He was a great guy, …excellent student, electronic engineering as I remember.

      1. Um no haha. WOuld be nice to have some nice and rich grandpa somewhere though. And a healthy one too. Osipov is quite common last name in Russia. Most Russians are smart. 🙂

    9. I’m a novice with a meat thermometer, but I have one encased in silicone.
      I’m not sure if I should insert the thermometer and then cook, checking the reading on the dial, or pierce the meat later, after one hour to chec it? Wouldn’t that release all the juiciness? Thanks to anyone who might have an answer for me ?

      1. You check with thermometer after. Insert in the thickest part, wait till T stops rising and remove. Small poke won’t release all juices.

    10. 5 stars
      I forgot what event or holiday I made this but it was very very good. Best way to cook boneless lamb leg. Had to find the recipe to make it again tonight! Thank you

    11. 5 stars
      This was delicious! I did have to increase the roasting time, though. My 4.25 lb. roast took 90 minutes to reach 127 degrees. So flavorful!

    12. 5 stars
      This roast was really good. ve never had Lamb before, it was good. I served it with fresh green beans, yellow squash

    13. 5 stars
      Love the different temps and times, Hubby and I like our lamb well done and this is perfect. We usually have chops but this is so easy and love the leftovers so will do it again.

    14. 5 stars
      My husband loves lamb. But we don’t have it often. We had our 2.06 lb boneless leg of lamb roast for our Easter dinner. I love your recipe! It was so easy and very delicious! My husband is raving about it. I added oregano and savory along with the rosemary. Thank you.

      1. Trying this now and first time using a meat thermometre. When you check the temp, is your suggestion for doneness before or after it sits for 15 minutes?

    15. 5 stars
      I baked a 3# boneless roast (in casing) for exactly 60 minutes at 350 degrees, after braising all sides on stovetop to seal juices. It was perfect.

    16. 5 stars
      This came out nice and juicy just as you said it would. I used fresh rosemary and thyme and used a whole head of garlic. I put it all in my small food processor and added the olive oil then slit the meat and stuffed it in and rubbed it all around – wow was it delicious!!

    17. 5 stars
      Easier instructions could not be possible. I’m so very excited to try this tomorrow, Easter Sunday, April 12, 2020.

      1. 5 stars
        I like the recipe and added a few modifications.

        Overnight , I pat dry and season the lamb with Any combination of favorite salt : Himalayan , Mediterranean, or Sea salt as well as pepper: Peppercorn, Black, etc.

        Layer chopped onion over all around lamb, seal and refrigerate.

        Next day : Baste olive oil all over lamb.

        Heat up skillet to medium high and sear all sides of lamb roast approximately 2 minutes per side.

        Place in oven at 380 degrees.
        Rotate pan every 30 minutes and check temp after 1 hour of oven time

    18. 5 stars
      I had never cooked a leg of lamb, bone-in or boneless until I cooked this. I followed your recipe and placed my boneless 2.63 lb leg of lamb in a round, Pfaltzgraff(-like) crock (not sure of the brand) because that was the closest thing I had to a dutch oven. I covered the top of the meat with carrots and potatoes and I cooked it at 425 for 43 minutes. I removed it from the oven and the temperature was barely at 130 for medium but it still looked way too underdone for my taste so I moved the vegetables to a separate dish and cooked the lamb another 10 minutes, let it rest 10 min and then sliced it. It ended up being cooked to medium-well, barely pink.

      I wondered if by adding the vegetables on top it interfered with the cooking time a bit but overall it was DELICIOUS! Very tasty and very tender! I will definitely be cooking this again. Thank you so much for sharing your wonderful, easy recipe.

    19. 5 stars
      Yum! My house smells so good and this is the first time I’ve made this. Thank you for sharing your family favorite!

    20. 4 stars
      Thank you I’m trying it right now. I have the oven set at 360 but you’re recommending a much higher temperature so maybe I should turn the oven up, I don’t want to burn but I don’t want it rare either. I am looking for my meat thermometer oh dear!

      1. How did the leg of lamb turn out Kathy? Yes, I do recommend a higher temperature of 425F as I find it yields juicy meat inside with a nice browned outside. You just need to check the meat regularly with an internal meat thermometer!

    21. 5 stars
      Perfect…. Thank you for all the instructions…. I know it is simple but some people don”t know how to do it… All these instructions and videos have made me a really good cook..

    22. 5 stars
      I love all you share with such care. You make every recipe so easy to follow. Thank you for all you share. My 4 1/2 boneless lamb roast came out wonderfully. I made it today for our 2020 New Year’s dinner. Every one ate until totally happy. My whole family asked for the recipe. Absolutely love your recipe. Thank you.
      T.

      1. Awe, you are so welcome, Tanya! So happy to hear you are enjoying my recipes! Thanks so much for sharing my recipe with family and friends!

    23. 5 stars
      This is a good recipe to save since I didn’t have to buy ingredients I didn’t have on hand. The cooking time was perfect and we all enjoyed the meal. There was more slivered garlic left after I filled the inserts, so I made a few more slashes in the lamb and added more garlic.

      The cooking time was perfect and the lamb was pink in the center after 90 minutes at 425 degrees. Next time I’ll remember to roast some veggies along with the lamb.

    24. 5 stars
      The timing and internal heat suggestions were so helpful! I’ve never made lamb before and this recipe made it very easy and turned out great! Thank you!

    25. I plan on trying your recipe on Christmas. I hope to use the rotisserie on my power air fryer (if the lamb is no to big). I know the cooking times and oven temperature will be different

    26. What kind of roasting pan do you use? Stainless steel? Aluminum? Non-stick?
      Also, do you use a rack in the pan so the fat drips off?

          1. 4 stars
            Bought a 5 pound Costco boneless roast and followed the directions exactly. Surprisingly, came out a little tough. I think perhaps my husband cut the slices a little too thick, so that may be why. I will try making it again for Easter.

          1. Oh my gosh. How come we are not neighbours?! Doesn’t mean we would see each other all winter but still more chances for your deliciousness. 🙂

      1. I recommend finding an Irish Lamb Stew on the internet. If you have leftover roasted new potatoes and/or carrots, you can add them. Also, I find that the Lamb Stew only gets better after the next day and the extra freezes well. After freezing, sometimes the potatoes break up, but that only thickens the gravy.

    27. Hi, I was just reading your recipe and wondering if you’ve ever tried this exact recipe but in a slow cooker. I usually make my lamb shanks in a slow cooker and come home with a wonderful aroma for supper. Do you think it can be done with a boneless leg of lamb?

    28. 4 stars
      Quicker and easier way I use for a boneless leg of lamb. Remove lamb from string pouch first and open it out flat.
      Kosher salt and pepper on both sides. Combine oil, crushed garlic, rosemary, grated lemon rind and rub generously on the non-fat side. Bake at 450 F for about 20 minutes or desired doneness. This also works great on a gas grill. Just treat it like a very thick steak.

    29. 5 stars
      I cooked this recipe tonight for my wife, in our 5th wheel’s little oven and it was delicious!!! I am a disabled Marine and it wasn’t difficult to cook at all… It might have taken me a little longer to prep but I have nothing but time on my side these days…
      Semper Fi

      1. Good for you, Jerry! Lamb is easier than many people think. The lewy is to stop cooking it at the right time. And you must have a kick ass 5th wheel.:) Usually RV ovens are quite slow…

    30. 5 stars
      I love lamb. Lived in Turkey for 2 years(military dependant) Lamb is the meat of choice. Getting ready to try your recipe. Thank you.

      1. 130 F is an internal temperature of meat to check with meat thermometer for desired doneness when it’s cooked. Sorry I just saw this comment. Hope not too late but sorry if it is.

    31. 5 stars
      I made this recipe for Christmas Day. It turned out beautiful! Not only that, it was simple to make and left me more time with my family! Thank you Olena for this recipe!

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