Equipment
Ingredients
Lamb & Five-Ingredient Marinade
- 1500 g boneless leg of lamb, butterflied and trimmed of thick fat caps
- 6 garlic, minced
- 15 g fresh rosemary, finely chopped
- 1 lemon, zested and juiced
- 60 ml extra virgin olive oil
Staple Seasonings
- 15 g kosher salt
- 5 g black pepper, freshly ground
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 605 kcal
- Protein
- 48 g
- Carbohydrates
- 3 g
- Fat
- 44 g
- Fiber
- 1 g
- Sugar
- 0 g
- Sodium
- 1022 mg
- Saturated Fat
- 5 g
- Monounsaturated Fat
- 7 g
- Polyunsaturated Fat
- 1 g
- Potassium
- 211 mg
- Calcium
- 22 mg
- Iron
- 4.2 mg
- Magnesium
- 18 mg
- Phosphorus
- 135 mg
- Zinc
- 3.8 mg
- Vitamin A
- 4 mcg
- Vitamin C
- 9 mg
- Vitamin E
- 1.5 mg
- Vitamin K
- 7 mcg
- Vitamin B6
- 0.1 mg
- Thiamin
- 0.02 mg
- Riboflavin
- 0.01 mg
- Niacin
- 0.1 mg
- Folate
- 5 mcg
- Water
- 16 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
In a mixing bowl, combine the minced garlic, chopped rosemary, lemon zest, lemon juice, olive oil, kosher salt, and black pepper. Stir vigorously to create a cohesive paste.
Place the butterflied leg of lamb in a large non-reactive dish. Massage the marinade paste thoroughly into both sides of the meat, ensuring it reaches into the crevices of the butterflied cuts. Cover tightly and refrigerate for at least 4 hours, or ideally overnight.
Remove the lamb from the refrigerator 45 minutes before grilling to take the chill off. Meanwhile, prepare your grill for two-zone cooking. Preheat one side to high heat around 200°C/400°F, leaving the other side unlit for indirect cooking.
Wipe the excess oil and garlic bits from the lamb to prevent bitter flare-ups. Place the lamb directly over the hot zone of the grill. Sear until a deeply browned, slightly charred crust forms, about 5 to 7 minutes per side.
Move the seared lamb to the cooler, indirect side of the grill. Close the lid and continue to cook until an instant-read meat thermometer inserted into the thickest part of the leg reads 54°C/130°F for a perfect medium-rare.
Transfer the grilled lamb to a large cutting board. Tent loosely with aluminum foil and let the meat rest undisturbed for 15 minutes. This allows the heat to stabilize and the muscle fibers to relax and retain their juices.
Carve the rested lamb across the grain into thin slices. Transfer to a serving platter and spoon any accumulated resting juices over the top of the sliced meat before serving.
Chef's Notes
- Butterflying a leg of lamb is the ultimate barbecue hack. It reduces cooking time dramatically, exposes more surface area to the flavorful marinade, and allows you to cook sections to different doneness levels to satisfy all guests.
- Do not marinate lamb in lemon juice for longer than 24 hours. The high acidity will begin to chemically 'cook' the meat, resulting in a mushy exterior texture.
- If you prefer to use a traditional smoker, set the ambient temperature to 110C (225F). Smoke the lamb until the internal temperature reaches 46C (115F), then move it over blazing hot coals to reverse-sear until the crust forms and internal temp hits 54C (130F).
- Slicing against the grain is critical for butterflied lamb. Because the muscles run in various directions throughout the leg, you may need to rotate the meat as you slice to ensure you are consistently cutting perpendicular to the fibers.
Storage
Refrigerator: 3 days — Store sliced lamb tightly sealed. Wrap airtight to prevent oxidation.
Freezer: 2 months — Freeze in vacuum-sealed bags with a little bit of olive oil to maintain moisture.
Reheating: Gently warm slices in a skillet over low heat with a splash of broth or water to prevent overcooking, or serve cold in sandwiches.
Troubleshooting
Meat is dry and tough to chew
Cause: The lamb was overcooked past medium or sliced immediately without resting.
Fix: Slice the meat paper-thin against the grain and serve smothered in a wet sauce like tzatziki or an olive oil chimichurri to reintroduce moisture.
Prevention: Always use a digital thermometer to pull the meat at 54C and strictly enforce a 15-minute resting period.
Bitter, burnt taste on the exterior
Cause: Excess oil and garlic were left on the meat during the high-heat searing phase, causing flare-ups and burnt aromatics.
Fix: Use a sharp knife to scrape away the burnt garlic bits before slicing and serving.
Prevention: Wipe away chunky marinade pieces and excess oil before placing the lamb over direct fire.
Cultural Context
Barbecuing large cuts of meat over live fire is a cornerstone of American outdoor cooking, deeply rooted in traditions of summer gatherings and holiday weekends. While pork and beef often dominate Southern barbecue pits, grilled leg of lamb infused with garlic and rosemary represents a Mediterranean-American fusion that gained immense popularity during mid-20th century backyard cookouts. The rich wood smoke from a charcoal grill perfectly complements and mellows the robust, slightly gamey profile of the lamb.
