Roast leg of lamb is the ultimate Sunday dinner—juicy, tender, and so impressive you’ll feel like a kitchen superstar (even if you’re secretly nervous). This recipe is all about big flavors, minimal fuss, and show-stopping results. We’re talking a bone-in lamb leg rubbed down with fresh rosemary and garlic, roasted until perfectly pink, then draped in rich, homemade gravy.
It’s the kind of meal that disappears fast—so don’t count on leftovers!
Why You’ll Love This Roast Leg of Lamb
- Tender, juicy, and full of flavor: The garlic rosemary rub is classic for a reason, and the lamb comes out blushing pink and melt-in-your-mouth.
- Easy but impressive: No tricky techniques—just a simple rub, hot oven, and some patience.
- Killer gravy: Those pan drippings turn into the best gravy you’ve ever poured.
- Perfect centerpiece: For holidays, family dinners, or whenever you want to impress.
What You’ll Need
For the Lamb
- Lamb leg (bone-in): 2.75–3 kg (about 6 lbs), the star of the show.
- Fresh rosemary: Finely chopped for the rub, plus a few sprigs for roasting.
- Garlic: Minced for the rub, and two whole heads, halved, for roasting with the lamb.
- Olive oil: Helps the rub stick and adds richness.
- Salt and black pepper: Always.
- Optional: If you love onion, toss a few quarters into the roasting pan for extra flavor.
For the Gravy
- Pan drippings: The secret ingredient!
- All-purpose flour: For thickening.
- Beef stock/broth: Use low sodium for best results—beef gives the gravy deep color and flavor.
For precise amounts, check the recipe card at the end of the post.
Ingredient Swaps & Tips
- No fresh rosemary? Use thyme or oregano, but nothing beats the flavor of fresh rosemary here.
- Can’t find bone-in lamb? You can use boneless, but bone-in adds more flavor and moisture.
- No beef broth? Chicken broth works in a pinch, but your gravy will be paler.
- Love veggies? Add potatoes, carrots, or parsnips to the roasting pan for an all-in-one meal.
How to Make Roast Leg of Lamb
Ready for a roast you’ll want to brag about? Here’s how to nail it every time:
Step-by-Step Description
This recipe is about letting the lamb shine—just a few classic ingredients, a quick rub, and a smart roasting technique for pink, juicy slices.
Instructions
- De-chill the Lamb:
Take your lamb out of the fridge at least 1 hour before roasting. This helps it cook evenly (no gray rings of overdone meat!). - Preheat & Prep:
Preheat oven to 240°C/475°F (220°C fan). Mix rosemary, minced garlic, and olive oil in a bowl.
- Rub & Season:
Place lamb in a roasting pan. Rub all over with the rosemary-garlic-oil mix. Sprinkle salt and pepper all over (do this after the rub for even coverage).
- Build a Flavor Base:
Scatter halved garlic heads and extra rosemary sprigs under the lamb, cut sides up. This infuses the drippings with flavor for gravy.
- Start Hot:
Roast for 20 minutes in the hot oven to get that gorgeous color on the outside.
- Lower Heat & Finish:
Reduce oven to 200°C/400°F (180°C fan) and roast for about 1 hour, or until the internal temp reaches 53°C/127°F (for perfect medium-rare). Start checking at 45 minutes—every oven is different! - Rest:
Transfer lamb to a plate, loosely cover with foil, and let it rest for 20–60 minutes. The temp will rise as it rests (aiming for 62°C/144°F for medium-rare). - Make Gravy:
Place roasting pan with drippings over medium heat. Discard rosemary sprigs. If needed, add butter to make about 4–5 tablespoon of fat. Add 4 tablespoon flour, stir for 1 minute, then gradually whisk in 2.5 cups beef broth. Mash the roasted garlic into the gravy for max flavor. Simmer until thickened, strain, and pour into a jug.
- Carve & Serve:
Slice lamb against the grain, serve with gravy, and don’t forget peas, buttered carrots, and crispy roast potatoes for the full experience!
Tips for Perfect Roast Leg of Lamb
- Use a meat thermometer: It’s the only way to guarantee perfect doneness!
- Take the lamb out early: Pull it from the oven at 53°C/127°F. It’ll rise to 62°C/144°F as it rests (for blushing pink, juicy meat).
- Let it rest: Resting is what keeps the juices in the meat, not all over your cutting board.
- Don’t skip the garlic base: Roasting lamb over garlic heads flavors both the meat and the gravy.
Serving Ideas
- Classic: With peas, buttered steamed carrots, and crunchy roast potatoes (duck fat or classic).
- Modern twist: Serve with roasted root veggies, herby couscous, or a crisp salad.
- Leftovers: Make epic sandwiches or toss into salads and grain bowls.
Storage & Reheating
- Fridge: Slices keep for up to 3 days, gravy for up to 5 days.
- Freezer: Freeze sliced lamb and gravy in portions for up to 2 months.
- To reheat: Warm gently in the oven, covered with a splash of broth, or microwave slices until just hot.
FAQ
Use a meat thermometer! For medium-rare, pull it at 53°C/127°F and let it rest to 62°C/144°F.
Fresh is best, but dried works in a pinch—use about half the amount.
Roast your lamb over halved garlic heads, use the pan drippings, and finish with beef broth for a rich, flavorful gravy.
For a 6 lb leg, use about 1.5 tablespoon fresh rosemary, 3 garlic cloves, 2 tablespoon olive oil, 1.5 teaspoon salt, and ½ teaspoon black pepper.
Roast Leg of Lamb
- Total Time: 2 hours 5 minutes
- Yield: 6–8 portions 1x
Description
This roast leg of lamb is everything a cozy, celebratory dinner should be: juicy, full of flavor, and simple enough for anyone to nail. It’s proof that with a good rub, a hot oven, and a trusty thermometer, you can make a show-stopping meal without the stress.
Ingredients
- 2.75–3 kg (6 lb) bone-in lamb leg
- 1.5 tbsp fresh rosemary, finely chopped
- 3 garlic cloves, minced
- 2 tbsp olive oil
- 1.5 tsp salt
- ½ tsp black pepper
- 2 whole heads garlic, halved
- Few rosemary sprigs (optional)
- 4 tbsp all-purpose flour
- 2.5 cups low-sodium beef broth
Instructions
- Remove lamb from fridge 1 hour before roasting.
- Preheat oven to 240°C/475°F (220°C fan).
- Mix rosemary, minced garlic, and olive oil. Rub all over lamb.
- Sprinkle salt and pepper over the lamb.
- Place halved garlic and rosemary sprigs under lamb in roasting pan.
- Roast 20 min, then reduce heat to 200°C/400°F (180°C fan) and roast 1 hour (check temp at 45 min).
- Remove at 53°C/127°F internal temp. Rest 20–60 min (temp will rise to 62°C/144°F).
- For gravy, heat pan drippings, add flour, cook 1 min, whisk in broth, mash garlic, simmer, strain.
- Carve lamb and serve with gravy, potatoes, peas, and carrots.
Notes
Always use a meat thermometer for best results. For boneless lamb, reduce roasting time and check earlier. Add roasted veggies to the pan for a complete meal.
- Prep Time: 5 minutes
- Cook Time: 1 hour 40 minutes
- Category: Main Course
- Method: Roasting
- Cuisine: Mediterranean
Nutrition
- Serving Size: 1 portion
- Calories: 520
- Sugar: 0g
- Sodium: 450mg
- Fat: 38g
- Saturated Fat: 15g
- Unsaturated Fat: 20g
- Trans Fat: 0g
- Carbohydrates: 3g
- Fiber: 0g
- Protein: 42g
- Cholesterol: 130mg
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