Roasted Leg of Lamb
This post may contain affiliate links. Please see our privacy policy for details.
This recipe is so good yet it doesn’t require too much time, effort or ingredients. It’s easy & fool-proof, even for you first-timers!
Featured Comment
If you haven’t cooked a leg of lamb before, don’t be intimidated. I know it seems incredibly daunting but it’s so much easier than you think. This roasted leg of lamb recipe here is fool-proof and fuss-free, I promise. And you don’t even need a long drawn-out ingredient list.
Nope, the ingredient list is super simple here.
Ingredients
Leg of lamb
Bone-in will have extra flavor.
Garlic
Adds a lovely buttery flavor profile.
Olive oil
This will serve as the rub for your lamb. We recommend using good quality olive oil here such as California Olive Ranch (our favorite).
Fresh herbs
Chopped fresh rosemary and thyme are common pairings with leg of lamb but you can also improvise with some of your favorite herbs.
Dijon
Adds a sharp, tangy flavor to your lamb rub, balancing out the rich taste of the lamb meat.
Salt and pepper
Season generously! 1/2 – 1 teaspoon kosher salt is recommended per pound of lamb.
Now I left the shank on for it’s dramatic presentation but you can easily purchase one with the shank removed – there’s no advantage here except for the aesthetic eye for serving.
Marinating is also not needed here – you’ll see that the simple garlic mixture rub will bring in so much flavor. And it’s sure to be a crowd-pleaser for your Easter holiday or next dinner party, impressing all your guests with such minimal effort. It also pairs perfectly with these mini hasselback potatoes!
tips and tricks for success
- Go to a reputable butcher. Cooking such a large cut of meat can be daunting! We recommend purchasing a leg of lamb that is preferably grass-fed and organic. Ask for market weight, avoiding baby lamb or mutton. The butcher can also trim the excess fat.
- Bone-in is ideal. Bone-in will have extra flavor, but if you are nervous about carving and serving, boneless can be used.
- Fresh herbs are best. Although you can certainly substitute dried herbs, fresh herbs are key here, delivering the best kind of flavor.
- Use an instant-read thermometer for the most accurate results. Check your lamb halfway through cooking, inserting through the thickest part of the meat but avoiding the bone. The internal temperature should reach 135°F for medium.
- Let your meat rest. As with any large cuts of meat, let your lamb rest for at least 15 minutes prior to serving, allowing the juices to redistribute – this will allow for maximum flavor and juiciness.
what to serve with leg of lamb
Roasted Leg of Lamb: Frequently Asked Questions
Bone-in will have more flavor, but boneless will be much easier to carve. If purchasing boneless, we recommend purchasing oven-safe kitchen twine as the lamb will need to be tied together.
Because a leg of lamb is so naturally tender, marinating is not necessary.
Absolutely! But because dried herbs are often more potent/concentrated than fresh herbs, you need less when using dry. The correct ratio is 1 tablespoon fresh herbs to 1 teaspoon dried herbs.
This really depends on personal preference. We recommend medium (135°F, 20 minutes per pound) but you can also cook to rare (125°F, 15 minutes per pound), medium well (145°F, 25 minutes per pound) or well done (155°F, 30 minutes per pound).
Yes! Leftover lamb can be stored in an airtight container for 1-2 days in the fridge, and frozen in slices wrapped in aluminum foil, reheating at 350°F (still wrapped) until warmed through.
Here is a foolproof step-by-step video guide for a stress-free leg of lamb!
Roasted Leg of Lamb
Ingredients
- 1 (5 pound) bone-in leg of lamb, trimmed
- 4 cloves garlic, minced
- 1 tablespoon olive oil
- 1 tablespoon chopped fresh rosemary
- 1 tablespoon chopped fresh thyme leaves
- 1 tablespoon Dijon mustard
- 1 tablespoon kosher salt
- 2 teaspoons ground black pepper
Instructions
- Preheat oven to 350 degrees F. Line a shallow roasting pan with aluminum foil.
- Using paper towels, pat lamb dry. Using a sharp knife, score the top side of the lamb by making shallow cuts in a diamond pattern.
- In a small bowl, combine garlic, olive oil, rosemary, thyme, Dijon, salt and pepper.
- Place lamb, fat side up, on a rack in the prepared roasting pan. Spread garlic mixture evenly over the lamb, rubbing in thoroughly into the scored cuts.
- Place into oven and roast until it reaches an internal temperature of 135 degrees F for medium, about 1 hour 30 minutes to 1 hour 45 minutes, or until desired doneness. Let rest 15 minutes before slicing.
- Serve immediately with mini hasselback potatoes.
Video
Did you make this recipe?
Tag @damn_delicious on Instagram and hashtag it #damndelicious!
Thanks for a very easy recipe for a great meal. It compares to Prime rib in how good it is…..
First time ever cooking lamb. Wow!!! So delicious! Will definitely be making this again!! Roasted fingerling potatoes along side. Just perfect!!
Hi this a question not a review. How do you suggest one makes the leg of lamb and the mini hasselback potatoes for the same meal since they bake at different oven temperatures? Thanks
I wondered the same thing…
Great little recipe for a tasty roast lamb, that lived up to the websites name. My family loved it, so will definitely use it again! 🙂 xx
Excellent receipe. Made for a wonderful roast.
I have never made lamb in my life and this first time with this recipe went great. I did marinate for 3-4 hours and put on a roasting rack. For the first 15 minutes I put it on 450 then reduced to 350 for remainder of cooking. As I only had a 2 1/2 lb leg of lamb I only cooked for an hour and 15. I did not cover with foil and I used ground thyme and horseradish mustard. I did not have a bone-in but next time will try that. Mine was still very juicy and good but can see how bone in would be even more flavorful. I also put roasted new potatoes in bottom under rack in same pan and cooked same time as lamb. Made for meal in one pan. Easy and delicious. Served with side of steamed broccoli. Family liked it.
How long do I cook a 10 lb bone in leg of lamb
Excellent! Super easy and delicious. Let it rest for about an hour tented with foil. Great for easy entertaining with roasted carrots and salad with homemade blue cheese dressing.
The only thing missing is the Gravy lamb gravy is the best. I will forego the aluminum foil and make gravel with the drippings
I have a boneless leg roast, any advise on cooking time/ temp?
Is whole grain mustard used in this recipe or dijon mustard paste?
My family really enjoyed this Leg of Lamb Recipe. It was delicious!l
Hi. Your recipe looks easy & interesting. Question: Do I need to wrap lamb in foil?
This is a fantastic recipe. I tried it twice; the first on a three-year-old Icelandic ewe and the second on a yearling lamb. The latter was a LOT smaller than commercial breeds, so I eased back on the time by about 30 minutes-ish, using the thermometer of course.
I plan on trying the recipe on venison this season because why the hell not?
Ok, I consider myself a lamb expert. Aussies know how to cook lamb, we are raised on it. This recipe is basically identical to the one we use for roasts, but, minus the thyme. I grow thyme in my garden, so it was easy. Great addition, thank you!
Hi do you uncover while roasting??
I’ve been cooking lamb all my life but never used chopped thyme,but just the addition of the thyme took the lamb to a higher level if was simply delicious,I’ll certainly use this rub again.Thankyou for sharing this recipe.
Damn delicious having leftovers
Great recipe! My family devoured it! ❤️
So easy to follow instructions. The results, damn delicious.
Should I season a day before for more flavor?
Sounds Amazing. Planning to make tonight.
Question? Can you taste the mustard when you eat the lamb? My kids don’t like mustard.
Thanks
About to make this. Can I omit the rosemary? My family hates the taste.
It’s a recipe, you can omit whatever you want.
Loved this recipe, came out perfect. I sprinkled some cayenne pepper over it and used rosemary infused olive oil. Came out very flavorful and moist. Thank you.
Oooh man was that delicious!