Roast Leg of Lamb with Rosemary. A garlic-and-rosemary boneless leg of lamb roasted to a measured center temperature and rested before carving. The formula and timing below are working estimates for a future kitchen trial, not a claim that a batch has been made.
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A rosemary roast for the table
A boneless tied leg of lamb takes a simple paste of garlic, rosemary, lemon zest and olive oil. The recipe uses a hot start for browning, then a gentler oven to finish.
A four-pound roast and eight main portions are working estimates. Its center temperature, not the clock, controls the endpoint.
Choose the specified cut
Buy a boneless tied leg of lamb rather than substituting an untied, bone-in leg without changing the plan. Shape and weight influence how the center warms; a tie makes the roast more uniform.
Pat it dry before coating. Mix the minced garlic finely enough to cling without large pieces scorching on the outside.
Ingredients for 8 main portions
| Ingredient | Amount | Use |
|---|---|---|
| Boneless leg of lamb, tied | 4 pounds | Uniform roast; not bone-in for this timing proposal. |
| Garlic cloves, minced | 5 cloves | Rub. |
| Fresh rosemary, finely chopped | 2 tablespoons | Rub. |
| Lemon zest, finely grated | 1 teaspoon | Rub. |
| Olive oil | 2 tablespoons | Rub. |
| Fine salt | 2 teaspoons | Rub. |
| Freshly ground black pepper | 1 teaspoon | Rub. |
Step-by-step method
- Heat oven to 425°F. Pat dry one 4-lb boneless tied leg of lamb. Stir five minced garlic cloves, 2 tbsp chopped rosemary, 1 tsp lemon zest, 2 tbsp olive oil, 2 tsp salt and 1 tsp pepper into a paste, then rub over the roast.
- Set lamb on a rack in a roasting pan. Roast at 425°F for about fifteen minutes, then reduce oven to 325°F without opening it for long. Continue roasting and begin checking the thickest center before the estimated time runs out.
- Cook to at least 145°F at the thickest center on a food thermometer, then remove from oven; the remaining low-heat time might be roughly 60–95 minutes, but roast shape and oven vary. Do not treat color or an exact minute as an endpoint.
- Rest about twenty minutes on a clean carving board, which exceeds the USDA/FDA minimum three-minute rest for lamb. Remove twine and carve across the grain into eight provisional main portions. Record actual cooked weight, thermometer location and timing in a kitchen trial.
Two oven temperatures
Begin at 425°F for a brief fifteen-minute browning phase. Lower to 325°F and check the thickest center with a clean food thermometer before the projected end of cooking.
FDA safe-handling guidance gives 145°F and a minimum three-minute rest for whole lamb cuts. This recipe proposes a longer twenty-minute rest before carving; neither color nor a pink center image is a food thermometer.
Rest and carve
Transfer the roast to a clean board for twenty minutes so carving is less messy. Remove any twine and slice across the grain for eight provisional portions.
Avoid using a marinade or raw-meat board for the cooked slices. If the trial roast yields fewer or more portions, revise the serving size before publication.
Sides and leftovers
Pair with a separate green vegetable or potatoes rather than adding those unmeasured ingredients to the lamb card. The roast is different from the existing Chefly apple-and-sweet-potato lamb stew.
No specific leftover storage duration or reheated texture has been kitchen-tested here. The cooking schedule is deliberately a broad estimate because oven and roast shape vary.
Lamb roast questions
Does the timing work for bone-in lamb?
No. The measured working cut is a four-pound boneless tied roast.
How do I know it is cooked?
Check the thickest center for at least 145°F, then rest at least three minutes; this plan rests twenty.
Can I skip tying?
An irregular roast cooks unevenly. Tie or ask the butcher to tie it for this working approach.
Further reading and related Chefly recipes: BBC Food's rosemary and garlic roast leg of lamb; FDA safe food handling temperatures. These are relevant references and other dishes, not evidence that this proposed formula was tested.
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Roast Leg of Lamb with Rosemary. Category: Main Dishes. 8 main portions. Prep approximately 25 minutes; cooking approximately 110 minutes; additional cooling/chilling approximately 20 minutes; total approximately 155 minutes excluding preheat. Not kitchen-tested; nutrition not calculated.
Ingredients: 4 pounds Boneless leg of lamb, tied; 5 cloves Garlic cloves, minced; 2 tablespoons Fresh rosemary, finely chopped; 1 teaspoon Lemon zest, finely grated; 2 tablespoons Olive oil; 2 teaspoons Fine salt; 1 teaspoon Freshly ground black pepper.
Instructions: Heat oven to 425°F. Pat dry one 4-lb boneless tied leg of lamb. Stir five minced garlic cloves, 2 tbsp chopped rosemary, 1 tsp lemon zest, 2 tbsp olive oil, 2 tsp salt and 1 tsp pepper into a paste, then rub over the roast. Set lamb on a rack in a roasting pan. Roast at 425°F for about fifteen minutes, then reduce oven to 325°F without opening it for long. Continue roasting and begin checking the thickest center before the estimated time runs out. Cook to at least 145°F at the thickest center on a food thermometer, then remove from oven; the remaining low-heat time might be roughly 60–95 minutes, but roast shape and oven vary. Do not treat color or an exact minute as an endpoint. Rest about twenty minutes on a clean carving board, which exceeds the USDA/FDA minimum three-minute rest for lamb. Remove twine and carve across the grain into eight provisional main portions. Record actual cooked weight, thermometer location and timing in a kitchen trial.
Allergens: Check lamb handling and packaged spice labels for cross-contact. Review packaged ingredients and cross-contact before serving.
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Roast Leg of Lamb with Rosemary
- Total Time: 155 minutes
- Yield: 8 servings 1x
Description
Four-pound boneless leg of lamb with rosemary, garlic and lemon.
Ingredients
- 4 pounds Boneless leg of lamb, tied
- 5 cloves Garlic cloves, minced
- 2 tablespoons Fresh rosemary, finely chopped
- 1 teaspoon Lemon zest, finely grated
- 2 tablespoons Olive oil
- 2 teaspoons Fine salt
- 1 teaspoon Freshly ground black pepper
Instructions
- Heat oven to 425°F. Pat dry one 4-lb boneless tied leg of lamb. Stir five minced garlic cloves, 2 tbsp chopped rosemary, 1 tsp lemon zest, 2 tbsp olive oil, 2 tsp salt and 1 tsp pepper into a paste, then rub over the roast.
- Set lamb on a rack in a roasting pan. Roast at 425°F for about fifteen minutes, then reduce oven to 325°F without opening it for long. Continue roasting and begin checking the thickest center before the estimated time runs out.
- Cook to at least 145°F at the thickest center on a food thermometer, then remove from oven; the remaining low-heat time might be roughly 60–95 minutes, but roast shape and oven vary. Do not treat color or an exact minute as an endpoint.
- Rest about twenty minutes on a clean carving board, which exceeds the USDA/FDA minimum three-minute rest for lamb. Remove twine and carve across the grain into eight provisional main portions. Record actual cooked weight, thermometer location and timing in a kitchen trial.
Notes
Recipe-development draft; not kitchen-tested. Timing and yield are estimates. Nutrition has not been calculated.
Additional chilling, resting or cooling time: 20 minutes, included in the total.
Untested estimate: 15 minutes at 425°F then up to about 95 minutes at 325°F, governed by thermometer, and 20-minute rest; preheat excluded.
- Prep Time: 25 minutes
- Chilling, resting or cooling: 20 minutes
- Cook Time: 110 minutes
- Category: Main Dishes
Nutrition
- Serving Size: Approximately one carved main portion, pending actual cooked yield