Roast Leg of Lamb (Garlic oil marinade)

Roasting a leg of lamb is simple and easy. This recipe uses bone-in lamb with a garlic herb and olive oil marinade. Packed with flavor, this is a recipe to impress. Serve it with mashed or roasted potatoes, salad, and bread for a wonderful festive meal. Leftovers are great in sandwiches and wraps.

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A leg of lamb is a very impressive cut of meat. It comes from the back haunches of the animal. You can buy it boneless or bone-in. In addition, the average weight of a lamb leg is around 5 to 7 lbs. Also, it is best to buy a medium, not too young and not too old lamb; otherwise, the meat can be quite tough.

I recall the first time I tasted leg of lamb with a simple garlic marinade was at a quaint restaurant while I was on a date with my husband (before we got married). The tender meat practically melted in my mouth, and the garlic-infused flavors left me craving more. Experimenting with different ratios of garlic, olive oil, and herbs, I finally created a marinade that captured the essence of that memorable meal.

And, whenever I serve this garlic-marinated lamb to friends and family, it’s met with rave reviews. In fact, this dish has become one of the many favorites at our gatherings. It’s a testament to the power of simple, flavorful cooking and the enduring influence of a single memorable dining experience.

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How to make Leg of lamb with garlic oil marinade (Step by Step)

• Prep Lamb – Trim excess fat off the lamb and pat dry on all sides.
  Pro tip – If the lamb is wet, the marinade will slide off the meat as soon as it starts cooking. Also, If the meat was frozen, ensure that it is thawed at least an hour before marinating.
• Marinade – In a mortar and pestle (or food processor), crush the garlic, rosemary, and thyme. Next, add the paprika, coriander powder, olive oil, and lemon juice. Set aside.

• Marinate the lamb – Season the lamb with salt and pepper on all sides. Then, brush the marinade on all sides. Leave to marinate for an hour or up to 12 hours in the fridge. Thaw at least an hour or two before roasting.
  Pro tip – This is a large chunk of meat and not much exposed, so make sure to season generously with salt and pepper. Some of it will be absorbed inside the meat.
• Preheat the oven at 350°F / 180°C / Gas mark 4

• Place the leg of lamb in a roasting pan on the roasting rack. If using a thermometer, insert it into the center of the thickest part of the meat.
• Roast until you reach the desired temperature of doneness:
  • Medium rare – between 130 F to 135 F, approximately  20 minutes per pound.
  • Medium – between 135 F to 140 F, approximately 22 to 23 mins per pound
  • and Medium well – between 145 F to 150 F, approximately 25 minutes per pound
  • Well Done is between 155 to 165 F,   approximately 30 minutes per pound.
• When the thermometer reaches your desired temperature, remove the lamb from the oven. Then, loosely tent it with aluminum foil and let it rest for at least 15 minutes before slicing. In the meantime, make the gravy.
• Serve with mashed potatoes or roast potatoes.

Variations – Different Marinades for Leg of Lamb

• Moroccan Roast Leg of lamb 
• Roast leg of lamb with garlic butter marinade
• Lamb Shoulder in red wine
• Lamb Roast Shoulder Boneless
• Boneless Leg of Lamb

Tips for Juicy Roast Lamb Every Time

• Choose the right cut – A well-marbled leg of lamb with a layer of fat gives the juiciest, most flavorful roast.
• Thaw before roasting – Always let lamb thaw fully; chilled meat cooks unevenly.
• Season generously – A leg is thick, so overseasoning helps flavor penetrate while forming a crust.
• Use a roasting rack – Keeps juices flowing underneath and helps create that seared crust.
• Cook to temperature, not time – For medium-rare, pull lamb at 135°F; it will rise to about 140°F while resting.
• Avoid oven peeking – Each time you open the oven, heat escapes and slows roasting.
• Use a thermometer – Insert once and leave it in to avoid losing juices.
• Rest before carving – Let lamb rest at least 15 minutes so juices redistribute for a tender roast.

Troubleshooting Leg of Lamb (with Marinade)

Problem	Likely Cause	Solution (with Keywords)
Lamb is dry after roasting	Overcooked or carved too soon.	Use a meat thermometer and pull the leg of lamb roast at 135°F for medium-rare. Always rest the lamb at least 15 minutes before slicing.
Marinade flavor didn’t penetrate	Not marinated long enough, or not enough seasoning.	For best flavor, marinate leg of lamb overnight with garlic, rosemary, and olive oil. Make sure the lamb is fully coated.
Meat cooked unevenly	Lamb wasn’t thawed properly before roasting.	Always thaw the leg of lamb in the fridge overnight, then let it sit at room temp 1–2 hours before cooking.
Lamb roast is tough	Cooked past 150°F (well-done) or cooked too quickly.	Roast low and slow at 350°F. Stick to proper lamb roast cooking times per pound and avoid high heat.
No crust or sear on the outside	Lamb roasted directly on pan without airflow.	Place the lamb leg on a roasting rack so air circulates and a flavorful crust forms.
Too much juice lost while checking	Frequent poking or cutting into meat.	Insert a thermometer for lamb roast once and leave it in until the desired doneness. Avoid cutting before resting.
Garlic/herbs burnt on surface	Marinade applied too heavily on outer fat layer.	Pat lamb dry, brush on a thin coat of garlic herb marinade, and baste halfway through roasting.

What side dish do you serve with roast leg of lamb

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Frequently asked questions

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