Best Rosemary Roasted Lamb Recipes

ROSEMARY ROASTED LAMB

Steps:

• Preheat oven to 425°. In a small bowl, combine the oil, garlic, salt and rosemary; rub over lamb. Cover and refrigerate overnight. Place lamb, fat side up, on a rack in a shallow roasting pan., Bake, uncovered, 20 minutes. Reduce heat to 350°; bake 1-3/4 to 2-1/4 hours longer or until meat reaches desired doneness (for medium-rare, a thermometer should read 135°; medium, 140°; medium-well, 145°), basting occasionally with pan juices. Let stand 15 minutes before slicing.

ROSEMARY RACK OF LAMB WITH ROASTED POTATOES AND CARROTS FOR TWO

Steps:

• Preheat oven to 425°F. Rub lamb with garlic, rosemary, pepper, and 1/2 tsp. salt.
• Combine miso, paprika, 4 Tbsp. butter, and 1/2 tsp. salt in a small bowl; set aside.
• Peel potatoes. Working with one potato at a time, slice a thin sliver off one long side to make a flat bottom. Trim ends off, then slice vertically every 1/16", cutting down to 1/4" from the bottom. (To make sure you do not cut all the way through the potato, line it with chopsticks on each side to stop your knife.) Brush potatoes with miso butter, fanning slices open to get butter between each slice. Transfer to a rimmed baking sheet and roast 15 minutes.
• Remove baking sheet from oven and brush potatoes with more miso butter. Arrange lamb on baking sheet alongside potatoes and roast, brushing potatoes with miso butter halfway through, until an instant-read thermometer inserted into the thickest part of the lamb registers 125°F for medium-rare, and the potatoes are fork-tender, 20-25 minutes. Transfer lamb to a cutting board and let rest 10 minutes, and continue roasting the potatoes if needed until fork-tender.
• Meanwhile, mix honey, coriander, and remaining 1 Tbsp. butter and 1/4 tsp. salt in a small bowl, then brush over carrots. Arrange carrots on a baking sheet and roast until lightly browned and fork-tender, 15-20 minutes.
• Slice lamb between each rib. Brush potatoes with remaining miso butter, top carrots with parsley, and serve alongside lamb.

ROSEMARY, LEMON, AND GARLIC LEG OF LAMB WITH ROASTED POTATOES

Steps:

• Preheat oven to 350°F.
• Cut off and discard pith from zested lemon and cut off and discard zest and pith from other lemon. In a saucepan of boiling water blanch zest 1 minute and drain in a colander. Cut each lemon crosswise into 6 slices.
• In a small food processor blend rosemary, garlic, zest, 1 tablespoon oil, lemon juice, and salt until mixture is chopped fine.
• With tip of a small sharp knife cut small slits all over lamb and rub rosemary mixture over lamb, rubbing into slits. Arrange lemon slices in middle of a large roasting pan and arrange lamb on them. Roast lamb in middle of oven 45 minutes.
• Quarter potatoes and in a saucepan cover with salted cold water by 1 inch. Bring water to a boil and cook potatoes, covered, 5 minutes. Drain potatoes in colander and in a bowl toss with remaining tablespoon oil. Arrange potatoes around lamb and sprinkle with salt and pepper to taste.
• Roast lamb and potatoes, stirring potatoes occasionally, 55 minutes, or until a meat thermometer registers 140°F. for medium-rare. Transfer lamb to a cutting board and let stand 15 minutes. Increase temperature to 500°F. and roast potatoes and lemons in one layer 5 to 10 minutes more, or until golden. Transfer potatoes and lemons with a slotted spoon to bowl and toss with chives. Transfer potato mixture to a platter.
• Serve lamb, sliced thin across grain, with potatoes, garnished with rosemary and lemon wedges.

LAMB CHOPS WITH ROSEMARY PLUM SAUCE AND ROASTED ASPARAGUS WITH LEMON VINAIGRETTE AND DICED EGG

Steps:

• Preheat oven to 400 degrees F.
• Coat a large baking sheet with cooking spray.
• Arrange asparagus and potatoes on baking sheet and spray with cooking spray. Season with salt and black pepper. Roast 20 to 25 minutes, until tender and golden brown.
• Meanwhile, season lamb chops all over with salt and black pepper. Heat oil in a large skillet over medium heat. Add chops and sear 2 to 3 minutes per side, until golden brown. Remove lamb from pan and set aside. Add leeks to the same pan and saute 3 minutes, until soft. Return lamb to pan.
• In a small bowl, whisk together plum sauce, plum preserves and rosemary. Pour mixture over lamb chops. Simmer 5 minutes, until lamb is tender and medium-rare to medium.
• In a small bowl, whisk together lemon juice, lemon zest, oil and mustard. Season to taste with salt and black pepper. Arrange asparagus on a serving dish. Drizzle lemon vinaigrette over top. Top with diced egg. Serve lamb chops with asparagus and potatoes on the side and extra sauce (with leeks) spooned over top.

ROASTED MARINATED LAMB WITH LEMON AND ROSEMARY POTATOES

Steps:

• Roughly chop strips of lemon zest. In a medium bowl, combine lemon zest and juice, garlic, and rosemary; whisk in oil. Pat lamb dry and season with salt and pepper. Place lamb in a 1-gallon resealable bag and pour in marinade. Seal bag, pressing to remove as much air as possible. Turn bag several times to coat lamb in marinade. Let sit at room temperature 1 hour (or refrigerate overnight), flipping bag halfway through.
• Preheat oven to 450 degrees. (If lamb was marinated overnight, remove from refrigerator 1 hour prior to cooking.) Place potatoes in a large pot and cover with cold water by 2 inches; season with salt. Bring to a boil; reduce to a simmer and cook until potatoes are tender when pierced with a knife, about 15 minutes. Drain potatoes.
• Remove lamb from marinade, letting excess marinade drip back into bag. Place lamb on a plate; season generously with salt and pepper. Pour marinade into a roasting pan; add potatoes. Cook 15 minutes. Push potatoes to edges of pan; place lamb in center. Roast 15 minutes, then reduce oven temperature to 300 and cook until medium-rare (an instant-read thermometer should read 125 when inserted in thickest part of lamb), 1 to 1 1/4 hours, tossing potatoes halfway through.
• Tent pan loosely with foil and let lamb rest 20 minutes before slicing. Toss potatoes with pan juices and serve alongside lamb.

ANCHOVY AND ROSEMARY ROASTED LAMB

Steps:

• Marinate lamb:
• Mince garlic and anchovies and mash to a paste with a large heavy knife, then stir together with oil and rosemary in a small bowl. Pat lamb dry and transfer, fat side up, to rack in pan. Make several small 1-inch-deep slits in lamb with a paring knife, then rub marinade over entire surface of lamb, pushing some marinade into slits. Marinate lamb, loosely covered, at room temperature 1 hour.
• Roast lamb:
• Put oven rack in middle position and preheat oven to 400°F.
• Sprinkle lamb all over with salt and pepper, then roast until thermometer inserted into thickest part of lamb (almost to the bone but not touching it) registers 125°F for medium-rare, 1 1/2 to 1 3/4 hours (temperatures in thinner parts of leg may register up to 160°F). Let stand 30 minutes before slicing.

RACK OF LAMB WITH ROSEMARY ROASTED POTATOES AND SHALLOT VINAIGRETTE

Steps:

• Preheat oven to 375 degrees F.
• Roast the potatoes on a flat sheet pan until almost cooked through, approximately 20 minutes. Allow the potatoes to cool at room temperature for 20 minutes, or until they can be easily handled.
• With a paring knife, remove the skins of the potatoes without cutting into the potato itself. Place the peeled potatoes into a bowl. Combine the oil and rosemary. Place half of the mixture into the bowl of potatoes and toss. Season with salt and pepper. Return the potatoes to the sheet pan. Rub the lamb with the remaining half of the oil and rosemary mixture. Season with salt and pepper. In a heated saute pan, or on a hot grill, sear the loins on all sides. Place the potatoes and lamb in the preheated oven (on separate pans).
• Combine seasoned rice wine vinegar and minced shallots in a small bowl.
• When internal temperature of the lamb is 120 degrees, remove the lamb and let it rest for about 5 to 7 minutes. When lamb has rested, the potatoes will be ready. Toss them in the oil in which they were cooked to prevent dryness and ensure even seasoning.
• Pour the juices from the lamb into the bowl containing the shallots and vinegar. Season with salt and pepper. While constantly whisking, slowly pour in 1/4 cup of olive oil. To present, arrange the potatoes on plate, slightly off center. Use vegetables of your choice and place next to potatoes. Slice lamb into 4 equal-sized pieces. Fan the pieces using the bone for height in presentation. Drizzle with vinaigrette.

ROSEMARY AND GARLIC LAMB CHOPS WITH ROASTED POTATO AND ARTICHOKE SALAD

Steps:

• For the salad, preheat the oven to 375 degrees. Place the potatoes in a roasting pan and toss with 1 tablespoon of the olive oil. Roast until tender, tossing from time to time, about 40 minutes.
• Meanwhile, for the lamb, combine the garlic, rosemary, olive oil, salt and pepper. Rub the mixture all over the lamb and let stand for 30 minutes.
• Heat 1 teaspoon of the salad's olive oil in a heavy skillet, preferably cast iron. Add the canned artichoke hearts and saute until browned on all sides, about 5 minutes. Place the roasted potatoes, sauteed and raw artichoke hearts, fava beans and tomato in a large bowl and toss to combine. Season with 1 teaspoon of the salad's salt and pepper to taste.
• For the lamb, increase the oven temperature to 400 degrees. Place the lamb in a roasting pan and roast until medium-rare, about 30 minutes. Let stand for 10 minutes.
• Meanwhile for the salad, whisk together the vinegar, the remaining 1/2 teaspoon salt and pepper to taste. Slowly whisk in the remaining 6 tablespoons of olive oil. Add to the salad and toss to coat.
• Carve the lamb. Divide the salad among 4 plates and top each serving with 2 lamb chops. Serve immediately.

ROASTED LAMB CHOPS WITH ORANGE, GARLIC AND ROSEMARY PESTO RUB

Steps:

• Preheat oven to 375 degrees F. Combine the garlic, orange zest, rosemary, salt, pepper and olive oil in a small bowl, and stir until combined. Rub the lamb with the garlic mixture, gently pressing it into the meat. Place the lamb, meat side up, on a rimmed baking sheet. Allow to sit at room temperature for 30 to 45 minutes. (This is a good time to start the creme fraiche potatoes.) Roast lamb in the center of the oven ‑- 15 to 20 minutes for rare (the internal temperature on a meat thermometer will read 125 degrees F), 20 to 30 minutes for medium rare (135 degrees F), 25 to 35 minutes for medium (145 degrees F).
• Cover the surface of the platter with rosemary. Slice the rack into chops at the table, and serve.

ROASTED RACK OF LAMB WITH ROSEMARY JUS

Steps:

• Remove the fat cap from the lamb racks, leaving a thin layer of fat on top of the meat, and clean the fat and skin from the bones and wrap the bones in aluminum foil. Cut the racks in half (leaving you with four 4-bone servings).
• Heat a large skillet over high heat, season the racks with salt and pepper and sear fat side down in the hot skillet until well browned. Turn the racks, fat side up and place in a 350 degree F oven for about 30 minutes. You can use a probe thermometer to check the temperature. (At Siro's we roast the racks in a 325 degrees F convection, 20 to 25 minutes to get to medium).
• When the racks are at the desired temperature, remove from the oven and let rest for 5 minutes.
• While the lamb is roasting, heat a saucepan over medium-high heat and saute the shallots and garlic until soft. Add the Merlot, turn the heat down to medium, and reduce by half.
• Heat the demi-glace in another saucepan and let simmer slowly for twenty minutes. Stir in the reduced Merlot mixture a little at a time into the simmering demi-glace until you can just begin to taste the wine in the sauce.
• At this time we combine a little arrow root with cold water and stir it into the sauce to give the sauce a little bit of a shine and some thickening. Season with salt and pepper.
• To serve, ladle the sauce onto 4 warm plates, cut the lamb in half and serve with Roasted Garlic Bread Pudding, sauteed wild mushrooms, and a seasonal green vegetable.
• Set a skillet over medium heat and add 2 tablespoons oil. When hot add the onion, celery, carrot, bell pepper, scallion, and minced garlic. Cook until the vegetables begin to soften, mince the rosemary and briefly rub in your hand before adding to the vegetables. Cook for 2 more minutes, season with salt and pepper and let cool.
• Combine the whole eggs with the egg yolks and beat well. Stir in the heavy cream and the roasted garlic puree until well blended. Combine the cream mixture with the vegetables and the dried bread cubes and mix well.
• Allow the mixture to stand overnight, covered in the refrigerator.
• Beat the egg whites until stiff and fold into the bread pudding one third at a time and mound in a greased large muffin tin (you should get 4 to 6). Bake in a 350 degree F oven 45 to 60 minutes until golden brown.
• To roast garlic, cut the tops off the garlic heads and simmer in 1 cup of milk for 10 minutes. Drain, season with salt and pepper, and combine garlic with 3/4 cup oil. Place in a tightly covered pan and roast for 2 hours in a 275 degree F oven. Uncover and let cool. Strain the oil to remove unwanted garlic skin. Squeeze the garlic from the heads and place in a small blender and puree, adding the strained oil in a slow, steady stream to emulsify the oil into the puree.

ROASTED RACK OF LAMB WITH ROSEMARY-POMEGRANATE SAUCE AND GOAT CHEESE POTATO CAKE

Steps:

• For the lamb: Preheat the oven to 375 degrees F.
• Heat a large saute pan over medium-high heat and add the oil. Season the lamb with salt and pepper. Sear the lamb racks, fleshiest side down first. Let sit and brown about 2 to 3 minutes. Flip and sear the other side. Repeat with the other rack. Transfer lamb racks to a sheet pan.
• Combine the thyme and rosemary and press an even amount into each seared lamb rack. Let sit for a few minutes.
• Roast the lamb in the oven for 12 to 15 minutes. Remove from the oven and let rest for 5 minutes.
• Heat the apricot jam in a small saucepan over low heat. When the jam is melted, turn off the heat. Brush a light coating of jam on each piece of lamb.
• For the sauce: Heat a deep saute pan over medium heat and add the oil, lamb trimmings, and rosemary. Cook until the fat is a little cooked down and the trimmings are deep golden brown, 3 to 5 minutes.
• Deglaze the pan with the chicken stock. Reduce by two-thirds.
• Stir in the demi glace and pomegranate juice concentrate. Simmer until thickened, about 5 minutes. Remove from the heat.
• Strain the sauce and set aside. Just before ready to serve, re-warm the sauce and whisk in the butter. Taste for seasoning. Add salt and pepper, if needed.
• For the potato cakes: Preheat the oven to 400 degrees F.
• Grate the potatoes and blend with the flour, egg, salt, and pepper.
• Drizzle the oil into the small cast iron pans and fill halfway with the grated potatoes. Top the potatoes with salt, pepper, and goat cheese. Top with the remaining potatoes.
• Bake the potato cakes in the oven until golden brown and cooked through, 20 to 30 minutes.
• Turn the pans over to unmold the potato cakes.
• For the julienned vegetables: Heat a saute pan over medium heat and add some oil. Saute the julienned vegetables and season with salt and pepper. Cook until the vegetables are just softened, 3 to 5 minutes. Taste a bite and cook for another minute if the vegetables are still hard.
• To plate: Slice off 2 chops from each rack and then cut the meat from the rest of the rack into slices. Serve each guest 1 lamb chop on the bone and 3 slices of boneless meat. Serve with a potato cake and sauteed vegetables.

ROASTED LEG OF SPRING LAMB WITH ROASTED GARLIC AND ROSEMARY JUICE AND PORTOBELLO AND EGGPLANT RATATOUILLE

Steps:

• Portobello and Eggplant Ratatouille: Place the portobellos, eggplant, zucchini, yellow squash, onion, pepper, jalapeno and cherry tomatoes in a large bowl. Add olive oil and toss. Season with salt and pepper. Spread the vegetables in a single layer over grill. Grill over medium heat for 4 minutes. Turn and cook 4 more minutes. Starting with the tomatoes, remove all the vegetables from the grill. Place the vegetables on a cutting board and chop coarsely. Add garlic, rosemary, basil and salt and pepper to taste. Allow to sit 1/2 hour. After 1/2 hour drain 1/2 cup of the juice from the vegetables and save for the Roasted Garlic and Rosemary Juice.;
• Roasted Garlic and Rosemary Juice: Puree the garlic, rosemary, olive oil and ratatouille juice in a blender. Season with salt and pepper.;
• Roasted Leg of Lamb: Combine garlic, rosemary, salt and pepper in a bowl, or mortar, and crush together. Add oil and rub the mixture over the lamb vigorously, forcing the mixture into the meat. Skewer the lamb and place on a spit. Roast the lamb 1 1/2 hours over medium heat. Remove from heat and allow to sit for 10 minutes. Take the bone out and slice the leg into 1/4-inch slices. Arrange slices into a circle around the outside of a platter. Place the ratatouille in the center and drizzle juice around the lamb.

DR. JUNGER'S ROASTED LAMB CHOPS WITH ROSEMARY AND STEAMED ASPARAGUS

Steps:

• Directions Trim the woody ends off the asparagus. You may also peel off about 1 inch of the tough green fibrous sheath from the base of the asparagus stalks with a vegetable peeler. Put 1 inch of purified water and 1/2 teaspoon sea salt in a saucepan and bring to a boil. Place asparagus in the pan and steam for about 3 minutes, until tender but not soft (al dente). Drain and set aside. Make a paste of the olive oil, rosemary, garlic, and Dijon mustard. Brush the lamb chops with the paste. Using high heat, grill, sauté, or broil the lamb chops for 3 to 4 minutes on each side for medium-rare. Remove from heat and allow to rest. Place asparagus on a plate and arrange the lamb chops. For a delicious additional flavor note, roast some garlic cloves in a small oven-proof dish at 350˚F for 30 minutes and serve with lamb chops.

ROSEMARY-ROASTED RACK OF LAMB AND CHERRY TOMATOES

Steps:

• Preheat oven to 425 F. Rub lamb with 1 tbsp oil; sprinkle with 1.5 tsps rosemary, then salt and pepper. Place on large rimmed baking sheet. Place 2 tbsps oil, 1.5 tsp rosemary, and tomatoes in large bowl. Sprinkle with salt and pepper and toss to coat; scatter around the lamb. Roast lamb and tomatoes until thermometer inserted into thickest part of lamb registers 135 F for medium-rare, about 30 minutes. Let rest 10 minutes. Cut lamb between bones into individual chops. Arrange on platter with tomatoes.

GRILLED LEG OF LAMB WITH ROSEMARY, ROASTED PEARS, AND BLACK PEPPER POLENTA

Steps:

• Preheat oven to 350 degrees F.
• In a blender, combine the garlic, rosemary, and 3/4 cup of oil; season with salt and pepper. Puree until everything comes together to form a paste; set aside for a few minutes to let the flavors marry.
• Lay the lamb out flat, open like a book. Score the surface lightly with a paring knife. Rub the lamb with the garlic paste, being sure to get in the incisions. Roll up the lamb and tie with butcher's twine to hold the roast together.
• Prepare an outdoor gas or charcoal grill. Season the lamb generously with salt and pepper, and then place it on the hot grill (put it on the top rack if you are using a gas grill). Sear the outside of the meat, turning, until brown all around, but do not char. Close the grill cover and roast for 30 minutes. The lamb is done when the center is still pink and the internal temperature reads 135 degrees F. Allow the lamb to stand 10 minutes to let the juices settle before cutting off the twine and slicing.
• To prepare the pears, halve the pears lengthwise and cut out the cores. Place the pears face down on a baking pan. Drizzle with 4 tablespoons of oil, toss the 8 rosemary sprigs on top, and season with salt and pepper. Bake for 20 to 25 minutes, until the pears are fork tender.
• To serve, spoon some polenta on the base of the plate and lay a few slices of the lamb on top; drizzle with a little oil and season with salt and pepper. Put a pear on each plate, face up, and drizzle them with balsamic vinegar. Garnish with a rosemary sprig.
• In a large pot, bring the chicken stock and salt to a boil. Gradually whisk in the cornmeal in a slow steady stream. The liquid will be absorbed and the cornmeal will lock up; don't freak, just whisk through it. Lower the heat and continue to whisk until the polenta is thick and smooth, about 20 minutes. Add the cream and butter; continue to stir until incorporated, about 10 minutes.
• Remove from heat, fold in the Parmesan and black pepper and serve.

ROSEMARY AND GARLIC ROASTED LEG OF LAMB

Steps:

• Preheat the oven to 400 degrees F. Using your hands, rub the lamb all over with the lemon juice. Pat the garlic and rosemary evenly all over the surface of the meat. Season the meat with the salt and pepper and place the lamb in a roasting pan. Place the lamb in the oven and roast for 30 minutes. Reduce the oven temperature to 350 degrees F and continue to cook for about 1 hour longer for medium-rare, or until a meat thermometer inserted into the center of the roast registers about 145 degrees F to 150 degrees F (be careful that the thermometer does not touch the bone.) Remove lamb from pan and allow to rest for 10 to 15 minutes before carving. Position the roasting pan over your stove burners. Add mixed herbs and onions to pan, and stir to combine with pan drippings. Add chicken stock and wine to deglaze the pan, scraping the bottom with a wooden spoon to release any fond. Reduce over high heat until sauce consistency. Strain before serving, if desired. Slice lamb and serve with sauce drizzled over the top. Read more at: http://www.foodnetwork.com/recipes/emeril-lagasse/rosemary-and-garlic-roast-leg-of-lamb-recipe.html?oc=linkback

ROSEMARY RACK OF LAMB WITH ROASTED POTATOES AND CARROTS FOR TWO

Steps:

• Preparation Preheat oven to 425°F. Rub lamb with garlic, rosemary, pepper, and 1/2 tsp. salt.
• Combine miso, paprika, 4 Tbsp. butter, and 1/2 tsp. salt in a small bowl; set aside.
• Peel potatoes. Working with one potato at a time, slice a thin sliver off one long side to make a flat bottom. Trim ends off, then slice vertically every 1/16", cutting down to 1/4" from the bottom. (To make sure you do not cut all the way through the potato, line it with chopsticks on each side to stop your knife.) Brush potatoes with miso butter, fanning slices open to get butter between each slice. Transfer to a rimmed baking sheet and roast 15 minutes.
• Remove baking sheet from oven and brush potatoes with more miso butter. Arrange lamb on baking sheet alongside potatoes and roast, brushing potatoes with miso butter halfway through, until an instant-read thermometer inserted into the thickest part of the lamb registers 125°F for medium-rare, and the potatoes are fork-tender, 20-25 minutes. Transfer lamb to a cutting board and let rest 10 minutes, and continue roasting the potatoes if needed until fork-tender.
• Meanwhile, mix honey, coriander, and remaining 1 Tbsp. butter and 1/4 tsp. salt in a small bowl, then brush over carrots. Arrange carrots on a baking sheet and roast until lightly browned and fork-tender, 15-20 minutes.
• Slice lamb between each rib. Brush potatoes with remaining miso butter, top carrots with parsley, and serve alongside lamb.

LAMB CHOPS WITH ROSEMARY PLUM SAUCE AND ROASTED ASPARAGUS WITH LEMON VINAIGRETTE AND DICED EGG

Steps:

• Preheat oven to 400 degrees F.
• Coat a large baking sheet with cooking spray.
• Arrange asparagus and potatoes on baking sheet and spray with cooking spray. Season with salt and black pepper. Roast 20 to 25 minutes, until tender and golden brown.
• Meanwhile, season lamb chops all over with salt and black pepper. Heat oil in a large skillet over medium heat. Add chops and sear 2 to 3 minutes per side, until golden brown. Remove lamb from pan and set aside. Add leeks to the same pan and saute 3 minutes, until soft. Return lamb to pan.
• In a small bowl, whisk together plum sauce, plum preserves and rosemary. Pour mixture over lamb chops. Simmer 5 minutes, until lamb is tender and medium-rare to medium.
• In a small bowl, whisk together lemon juice, lemon zest, oil and mustard. Season to taste with salt and black pepper. Arrange asparagus on a serving dish. Drizzle lemon vinaigrette over top. Top with diced egg. Serve lamb chops with asparagus and potatoes on the side and extra sauce (with leeks) spooned over top.

ROASTED MARINATED LAMB WITH LEMON AND ROSEMARY POTATOES

Steps:

• Roughly chop strips of lemon zest. In a medium bowl, combine lemon zest and juice, garlic, and rosemary; whisk in oil. Pat lamb dry and season with salt and pepper. Place lamb in a 1-gallon resealable bag and pour in marinade. Seal bag, pressing to remove as much air as possible. Turn bag several times to coat lamb in marinade. Let sit at room temperature 1 hour (or refrigerate overnight), flipping bag halfway through.
• Preheat oven to 450 degrees. (If lamb was marinated overnight, remove from refrigerator 1 hour prior to cooking.) Place potatoes in a large pot and cover with cold water by 2 inches; season with salt. Bring to a boil; reduce to a simmer and cook until potatoes are tender when pierced with a knife, about 15 minutes. Drain potatoes.
• Remove lamb from marinade, letting excess marinade drip back into bag. Place lamb on a plate; season generously with salt and pepper. Pour marinade into a roasting pan; add potatoes. Cook 15 minutes. Push potatoes to edges of pan; place lamb in center. Roast 15 minutes, then reduce oven temperature to 300 and cook until medium-rare (an instant-read thermometer should read 125 when inserted in thickest part of lamb), 1 to 1 1/4 hours, tossing potatoes halfway through.
• Tent pan loosely with foil and let lamb rest 20 minutes before slicing. Toss potatoes with pan juices and serve alongside lamb.