Learn how to roast perfect Boneless Leg of Lamb Recipe every time! Herb crusted and garlic stuffed, this is an easy lamb roast anyone can make!
If you have meat with bone-in, use this leg of lamb recipe. We also absolutely love our braised lamb shanks and lamb stew!
Table of Contents
- Why You Will Love This Recipe
- Ingredients for Boneless Leg of Lamb
- How to Roast Boneless Leg of Lamb
- How Long to Cook Boneless Leg of Lamb?
- Tips for Best Results
- What to Serve with Leg of Lamb?
- How to Store and Make Ahead
- FAQs
- More Roast Recipes to Try
- More Lamb Recipes
- Roasted Boneless Leg of Lamb Recipe Recipe
My favorite way to celebrate anything is with this boneless leg of lamb recipe. I love roasting it because it’s so easy to do but looks grande on the table!
I created this recipe about 15 years ago. I make it for Easter dinner, Holidays or whenever I need to leave a lasting impression. Works every time!
Why You Will Love This Recipe
- Easy recipe: Boneless leg of lamb is actually the easiest red meat to roast. Lamb is expensive, so I understand your fear of “screwing it up”. You will not!
- Tender juicy meat: Thanks to the precise cook times for your preferred level of doneness.
- It’s for garlic all lovers: Stuffed with over 30 slivers of fresh garlic.
- Foolproof results: This lamb recipe is 15 years old, tried and tested on our family.
- Recipe with a video: If you are more of a visual learner, video instructions will be helpful.
Ingredients for Boneless Leg of Lamb
To make this recipe you will need 6 simple ingredients you more likely have on hand right now. 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. Or a mixture of both.
- 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 Boneless Leg of Lamb
- 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 (no need for a rack but you can use one), place deboned leg of 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.
- Important to 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 ones.
To roast potatoes in fat drippings (optional but so good)
Lamb is extremely fatty meat. You will see a lot of fat and 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. Not healthy and there is enough flavor in remaining juice and fat.
- 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: 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.
Recipe Tip
Do not drain fat into your sink to avoid clogged pipes. Instead, let it solidify for a few hours in a cup before discarding in the garbage.
How Long to Cook Boneless Leg of Lamb?
Here is a handy roasting times chart. Always check with a good internal meat thermometer. Cooking times are listed per 1 pound of meat.
| 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 |
All ovens vary due to age, electric vs. gas etc. Not to mention convection oven cooks food faster. So check 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.
Tips for Best Results
- Plan ahead: Roasting boneless leg of lamb in the oven is easy! It just needs enough cooking time. 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.
- 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. To cook any recipe in a convection oven, follow this easy formula: reduce the temperature by 25 degrees F or reduce the cook time by 25%. Today some ovens even offer convection conversion completely eliminating any guesswork!
What to Serve with Leg of Lamb?
Serve sliced lamb meat 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 healthy mashed potatoes, Instant Pot mashed potatoes, sweet potato mash, crispy Parmesan potatoes or this genius cauliflower mashed potatoes.
- Salads: Look for salads that are bright and colorful like traditional Greek salad, spinach avocado salad, tomato cucumber feta salad or this spinach salad recipe.
- Vegetables: Garlic green beans and baked asparagus are just classics. Also sauteed broccoli would be very nice!
How to Store and Make Ahead
Store: Refrigerate 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 refrigerator and then use as a protein in a salad for lunch, sandwich on-the-go or for lamb tacos!
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.
FAQs
No. Lamb is tender meat. You just need to season it properly. My absolute favorite classic seasonings are garlic and rosemary. Maybe a squeeze of lemon at the end. So, no lamb marinade recipe to follow.
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 Roast Recipes to Try
More Lamb Recipes
- Pan seared lamb chops
- Air fryer lamb chops
- Lamb loin chops recipe
- Grilled lamb kofta kebabs
- Garlic butter lamb chops
Roasted Boneless Leg of Lamb Recipe
Equipment
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.
Video
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.
I made this recipe for my family for Christmas dinner this year – can’t remember the last time I cooked a leg of lamb, so I was a little bit nervous. It came out perfectly cooked at 135 degrees F using the cooking times provided, and it was so delicious I couldn’t believe it. And the potatoes cooked in a thin layer of lamb fat were heavenly. Thanks for helping my Christmas be extra special this year!! It will be my go-to Christmas dinner now.
So glad you enjoyed it Sharon! Happy holidays!
It exceeded my expectations. I discovered that the thermometer I was using was registering too low of a temperature. I took measurements as per the receipt and used an alternative thermometer to discover this. The results were fantastic. Best lamb roast I’ve ever made. I’m curious about why he had the plumber over while cooking. I used to be a plumber in my second career and the cooks couldn’t afford to keep me around.
Glad you enjoyed it!
Best lamb leg I’ve ever eaten, I can’t believe that I cooked it at home following this recipe as opposed to at a fancy restaurant! I got the same bottle of olive oil as on the photo (Terra Delyssa from Whole Goods)
Yeah! So happy to hear of the lamb roast success! Happy Holidays!
My standard go-to, but I needed to confirm the cooking time. I agree with Olena. I was raised in France and just plain old fresh ingredients is the way to health. With that in place, you won’t need to “diet”
Thanks for the kind words, glad to hear this is your go-to!
Hi, You say to let lamb sit for 15 min after taking out of the oven but the potatoes/veggies will take 45 min after that. Do you reheat the lamb after the potatoes and veggies are done?
I don’t reheat the lamb. I keep it covered with a few layers of aluminum foil in the meanwhile or you can keep it warm in a warming drawer if you have one, or place in a microwave but don’t turn on.
Thank you! One mote question: how often do i keep checking the roast after the initial cook time (in my case, 45 min for a 2.5 lb roast)?
Approximately every 5 minutes or so.
Thank you for easy to understand instructions. Love leg of lamb!
So glad you enjoyed it!
Absolutely fantastic recipe. My first attempt at a leg of lamb, and it was a home run.
So happy to hear it was a success Edwin!
Going to try this recipe, just wondering about making a sauce with leftover juice, any thoughts? Thanks
Right… Leftover juice has a lot, a lot of fat. I would keep only 1 cup, add 1 cup any broth and follow this turkey gravy recipe. Of course, double other ingredients too.
I don’t cook red meat much at all, so I was nervous about how to roast a boneless leg of lamb. Thank you for making it so straightforward and also it was delicious! One thing – your recipe says to preheat/roast at 425 degrees, but then for roasting the potatoes afterwards, says to do it “at the same 450 degrees” – suggest you fix that. 🙂
Thanks for letting us know, we will get that fixed! And so happy to hear it went so well cooking wise!
This still has not been fixed. So, is it 425 or 450. I’m cooking now ar 450.
It’s 450. I fixed it now, sorry about that. You can cook it at either T as these veggies aren’t delicate so either T will work. Enjoy!:)
Where can I see the video for this delicious recipe?
In bottom left corner of your screen. If you are running an ad blocker, you will not see it though. Hope this helps.