How To Roast a Leg of Lamb: The Simplest, Easiest Method

Cooking Lessons from The Kitchn

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You can have the turkey. Leave the ham. Prime rib — what's that? In my house, leg of lamb is the celebratory roast. I love its tenderness and flavor, and it is of course the high season for lamb right now, as lamb figures prominently on both the Passover and Easter tables.

Have you ever roasted a leg of lamb? It may sound intimidating, but the sweet little secret is that leg of lamb is actually one of the easiest, most foolproof cuts of meat to cook. Here's our remarkably simple, fuss-free approach to cooking a leg of lamb. It will turn out perfectly every time.

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Expert Tips for Buying & Cooking a Leg of Lamb

While I've cooked lamb on many occasions, cooking a whole leg can still feel intimidating. It's a large, expensive cut of meat, and I always wonder whether I am going to dry it out or make it tough. Should I marinate it? Should I do something special to make sure it's cooked properly?

I spoke to my favorite local butcher, Bluescreek Farm Meats, in Columbus, Ohio, to learn a little more about leg of lamb and how to cook it.

Here are some expert tips from Jamie Smith at Bluescreek on what to look for in lamb, and how to cook it. A sneak peek: Cooking a leg of lamb is actually really, really simple.

What Is a Leg of Lamb?

When we talk about lamb leg, we mean one of the back haunches of the animal, and the most common cut includes the upper part of the leg only. (Think of the thigh, without the lower part of the leg.)

Shank On or Off?

Usually leg of lamb is sold without the shank attached; you are just buying the upper part of the leg, as seen here, without the lower part. You can order a leg of lamb with the shank left on, however; this is sometimes called an "American leg," but usually it's simply referred to as "shank-on leg."

Some people prefer this as it looks more traditional and dramatic on a serving platter, but there's no major advantage to having the shank, other than getting an extra soup bone!

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Boneless or Bone-In?

Jamie prefers bone-in, for the flavor. Think of how we make stock from bones, she said. The bones hold so much of the flavor. When you roast a piece of meat with the bone still in, you are getting all that flavor in the meat itself. A bone-in lamb leg can be a little trickier to carve, but we opted for bone-in in this cooking lesson (we'll show you how to carve it).

If you are really nervous about carving meat, boneless is fine; it's easier to slice. If you buy a boneless leg of lamb it will probably come in a net. When the bone is removed from the lamb, the meat needs to be held together in the shape of the leg for cooking, so heatproof, oven-safe netting is usually used. If your netting isn't oven-safe, you can tie it up with kitchen twine instead (or ask your butcher to do it for you!).

What Should I Ask for at the Butcher?

When buying a leg of lamb we recommend doing so from a quality and reputable butcher. A leg of lamb is expensive regardless of where you buy it, so we feel that the investment is best spent with a butcher who either raises the animals himself (as Bluescreek does on their farm) or who can tell you how the lambs were raised.

We look for lambs that are market weight, which means no baby lambs, and no lambs that are too old and verging on (tougher) mutton.

Also, ask the butcher if they can trim the lamb leg for you if they have not already done so. This means that they will trim away the fell, a thick outer layer of fat (which is what can make lamb taste so strongly "mutton-y"), as well as any additional fat that you request to have removed. Personally, I like a nice pad of fat, which insulates the meat and keeps it tender.

Should I Marinate a Leg of Lamb?

Now, how to cook your leg of lamb? Here's where things get really interesting.

"Lamb leg is a really tender cut," said Jamie at Bluescreek. "You don’t need to marinate it." In fact, she said, marinating lamb can actually make it tougher. A marinade is designed to break down the tough fibers in meat, but since lamb is naturally so tender, marinating can destroy the integrity of the meat — the texture and flavor — and make it tough to chew. "I would not marinate a lamb leg for more than two or three hours," said Jamie. "It's fine to follow a recipe, but be cautious."

To add flavor to the roast, we decided to skip marinating altogether and season it simply with herbs and garlic.

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Rare, Medium, or Well?

Personal preference should determine how long you cook your leg of lamb. Personally, I find rare and bloody lamb to be unappetizing. I prefer medium rare to medium — still tender, with a hint of pink. We calibrated our cooking lesson below to this stage of doneness, but consult the cooking chart below if you like your lamb done differently. I will say that such a large of cut of meat will probably have some variability; parts of the lamb leg were a little closer to medium, and others were closer to rare.

Internal Temperatures for Bone-In Leg of Lamb

All of these cooking times take into account the fact that we broil the lamb first to sear it. They also assume a resting period of at least 15 minutes, during which the lamb actually continues cooking internally. It's best, especially if you like rare or medium-rare lamb, to take it out at a lower temperature than those officially recommended by the USDA.

REMEMBER! These times are only guidelines. Depending on many factors, your lamb leg may roast slower or faster. Check after one hour and then continue roasting, checking frequently, until the lamb reaches your desired internal temperature.

Roasting Temperature: 325°F

  • Rare: 125°F (about 15 minutes per pound)
  • Medium-Rare: 130°F to 135°F (about 20 minutes per pound)
  • Medium: 135°F to 140°F (about 25 minutes per pound)
  • Well-Done: 155°F to 165°F (about 30 minutes per pound)

Lamb Is Already Tender: Don't Overdo It!

The primary takeaway, said Jamie, is that lamb is already a really tender cut of meat. Cooking should be simple. And that's what we'll show you here: a simple, easy way to cook a tender and juicy leg of lamb every time.

How To Roast a Leg of Lamb

10 servings, depending on size of the leg

What You Need

Ingredients
5 to 7 pounds lamb leg, bone-in
3 tablespoons olive oil
Salt and freshly-ground black pepper
6 cloves garlic
3 stems fresh rosemary

Equipment
Roasting pan, with rack
Aluminum foil
Sharp chef's knife or carving knife, for carving

Instructions

  1. Take the lamb out of the refrigerator an hour before cooking. Take the leg of lamb out of the refrigerator about an hour before cooking so it comes to room temperature. This promotes faster, more even cooking.
  2. Rub the lamb with olive oil. Set the lamb in a rack inside a roasting pan. Drizzle with olive oil and rub into the fat and meat.
  3. Season with salt and pepper. Sprinkle liberally with salt and pepper.
  4. Broil for 5 minutes. Turn on the broiler and position a rack below so that the top of the meat is a few inches from the broiler element. Broil the lamb for 5 minutes or until the top of the lamb leg looks seared and browned.
  5. Flip the lamb over and broil the other side. Flip the lamb over and put back under the broiler for 5 minutes or until the other side is seared.
  6. Top with garlic and rosemary. Take the lamb out of the oven. Turn off the broiler and set the oven temperature to 325°F. Reposition the oven rack to the middle of the oven. Mince the garlic and rosemary leaves. Flip the lamb leg over again and rub the top with the chopped garlic and rosemary.
  7. Cover the lamb loosely with foil. Tent the pan loosely with foil to keep the garlic and rosemary from burning. Put the lamb back in the oven and cook at 325°F for one hour.
  8. Remove the foil after an hour and take the temperature. Take the lamb's temperature and remove the foil. The lamb is ready (medium-rare to medium) when the temperature is 135°F (or above). At 135°F the lamb is cooked to rare, but it will continue cooking as it rests, so we recommend taking it out of the oven at 135° for medium-rare to medium. (Refer to the cooking chart above for general roasting times)
  9. If needed, continue cooking the lamb until done. Continue cooking the lamb (uncovered) until it reaches your preferred internal temperature. Check the temperature every 20 minutes until done.
  10. Let the leg of lamb rest. Let the lamb rest for at least 15 minutes before carving.
  11. Carve the lamb: Turn the lamb so the bone is parallel to the cutting board. Make perpendicular slices to the bone, angling straight down until your knife hits the bone.
  12. Carve the lamb: Cut the lamb off the bone by slicing through the bottom of the slices with your knife parallel to the bone.

Recipe Notes

  • To serve: We highly recommend serving the lamb with this mint pesto.
  • To store: Leftover lamb can be stored in the refrigerator for 3 days.
  • Freezing tip: Jamie recommends freezing leftover rare to medium-rare lamb in slices wrapped in foil. Then, to warm them, she puts the frozen slices, still wrapped, in a 350°F oven. This will warm them and not overcook them.
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Easter Recipes from The Kitchn

Per serving, based on 10 servings. (% daily value)
Calories
607
Fat
43.3 g (66.6%)
Saturated
17.5 g (87.3%)
Carbs
0.6 g (0.2%)
Fiber
0 g (0.2%)
Sugars
0 g
Protein
50.4 g (100.8%)
Cholesterol
185.1 mg (61.7%)
Sodium
155.5 mg (6.5%)

(Image credits: Leela Cyd)