This slow roasted lamb shoulder cooks low and slow, gently intensifying the flavors and coaxing the lamb to fall-apart-tenderness. And it couldn’t be any easier. Just toss some ingredients together, let them mingle in the fridge overnight, then toss it in the oven and forget about it for a few hours.
Even better, notes author Annie Rigg, there’s no need to fuss with making gravy since the onions and oranges create such beautiful pan juices.–David Leite
Why do I need to let my lamb rest?
Essentially, by letting the meat rest before slicing, you’re letting the protein fibers relax and the juices redistribute within the meat instead of all over your cutting board. Not resting your roast lamb, or any meat for that matter, is a common mistake that really does hinder taste and texture. If you’ve avoided doing it because you think you’re just gonna end up with cold lamb, then you’re in for a pleasant surprise.
We’re not telling you to leave it on the counter for hours—a 10 to 20 minute rest is all you need—loosely tent it with foil and get the rest of dinner ready. You can even put it on a pre-warmed platter if you’re really worried about heat loss.
Slow Roasted Lamb
- 1 heaping teaspoon cumin seeds
- 1 heaping teaspoon fennel seeds
- 2 small dried red chiles
- 1 teaspoon ancho chile powder or smoked paprika
- 3 tablespoons olive oil
- 3 tablespoons honey
- Salt and freshly ground black pepper
- 4 1/2 pounds bone-in lamb shoulder*, (or substitute boneless leg of lamb)
- 3 medium (about 1 lb) red onions, peeled and cut into wedges
- 2 Seville or bitter oranges, scrubbed and dried, then quartered (or substitute 1 thin-skinned orange and 1 thin-skinned lime)
- 2 heads garlic, unpeeled and halved horizontally
- 1 cinnamon stick
- 2 tablespoons pomegranate molasses
- In a small, dry skillet over low to medium heat, toast the cumin seeds, fennel seeds, and dried chiles until they start to become aromatic, shaking the pan almost constantly so that they toast evenly, about 1 minute.
- Lightly grind the toasted spices using a mortar and pestle but be careful not to reduce them to a powder. In a small bowl, combine the ground spices and chiles with the chile powder or smoked paprika, olive oil, honey, and salt and black pepper to taste.
- Using a sharp knife, cut 5 to 6 slashes into the lamb shoulder. Place the lamb in either a 2-gallon resealable plastic bag or a roasting pan and rub the spice mixture into the meat. Add the onions, oranges, garlic, and cinnamon stick. Massage everything together so that the meat is really well covered and then either seal the bag or cover the meat.
- Stash the lamb in the fridge for at least 8 hours or overnight. (Ideally, you’d flip the lamb occasionally to keep it evenly coated with the marinade, but this isn’t going to make or break your roast.)
- The next day, preheat the oven to 375ºF (191ºC). Place the lamb on the counter.
- If using a plastic bag, dump the lamb and the rest of the contents of the bag into the roasting pan. Make sure the lamb is skin-side up and that there is an even distribution of onions, oranges, and garlic around the meat, doing your best to keep the onions in intact wedges if possible. Roast the lamb, uncovered, for 20 minutes. Then cover the roasting pan tightly with foil, reduce the heat to 300ºF (149ºC), and cook until the lamb is tender and registers 160°F (71ºC) if you prefer medium doneness or 175°F (79°C) for fall-apart tenderness, which ought to take anywhere from 2 to 2 1/2 hours. When the lamb reaches the desired temperature, take it out of the oven and crank the oven back up to 375ºF (191ºC). Be aware that leg of lamb will take less time than lamb shoulder.
- Uncover the lamb, spoon the pomegranate molasses over the top, and then spoon the pan juices over the lamb while you wait for the oven to reach 375°F (191ºC). When the oven reaches temperature, slide the lamb and roasting pan back in the oven and cook, uncovered, until it’s nicely browned and sticky, 10 to 20 minutes.
- Loosely cover the lamb with foil and let it rest in the pan on the counter for a good 20 minutes.
- Meanwhile, using a slotted spoon or tongs, gently move the oranges, onions, and garlic to a plate. Strain the juices from the roasting pan into a fat separator or a bowl and set them aside until the fat rises to the surface. While the juices rest, squeeze some or all of the garlic cloves into the strained juices or reserve the roasted garlic for another use. If you used a Seville orange, you can finely chop it and scatter it atop the lamb for modest bursts of sweetly sour loveliness.
- When the lamb has rested, carve it as thickly or thinly as you please or grab a couple forks and use them to pull the meat from the bone into shreds. Pile the lamb on a platter. Serve it with the pan juices poured over the lamb or passed on the side.
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Nutrition information is automatically calculated, so should only be used as an approximation.
Recipe Testers’ Reviews
Well, this slow roasted lamb is a lovely dish and a subtly addictive mix of flavors.This was a big hit with my family of lamb lovers. I was a little concerned that there wasn’t a lot of marinade, but it turned out to be just the right amount when mingled with the lamb juices. Not overpowering, just lovely flavors.
I loved the warm smells from the toasting spices. The molasses caramelizes on the lamb and adds a bit of sweetness to the pan juices. There was a lot of fat, so I degreased the pan juices and added the roasted garlic to them. I used smoked paprika rather than ancho chile, and I think that was the better choice. The dish ends up with a slight smokiness, but not the chile heat. I couldn’t find Seville oranges, so I used one Cara Cara navel and one lime.
The timing worked perfectly for me. This piece of meat, at $15 per pound, was pretty expensive for a simple dish, and also a lot of meat for my small family. I know we’ll eat it all up, but I could see trying this recipe, timings adjusted, with lamb shanks, which have the bonus of being less fatty.
Lamb is just about my favorite meat, so I jumped at the opportunity to make this slow roasted lamb for a special Sunday dinner with friends. Said friends had access to Seville oranges and brought me some since I couldn’t find any in my area stores. Score! Pomegranate molasses was no problem to come by and I was off marinating.
I used a boneless, rolled-and-tied, grass-fed lamb shoulder that weighed 3 1/2 pounds. We all enjoyed the lamb, it seemed quite special and exotic, and it got me out of my usual garlic and rosemary routine. A roasting time of 2 1/2 hours total (I removed the lamb from the oven when it registered 160°F (71°C)) produced a tender, but not falling apart, lamb shoulder. I poured my pan juices into a measuring cup. I had 1/2 cup juice and 1/4 cup grease. I discarded the grease and then deglazed the pan with a little white wine and added that to my pan juices.
A minor detail that I took issue with was the instruction to cut the garlic heads in half horizontally. If you do this, the smaller ends of the garlic cloves just fall right out of the papers, and then you have messy papers floating around the pan. I think a much better instruction (and this is what I did with my second garlic head) is to cut just the bottom third off, most of the garlic stays intact this way.
Also, some of the orange wedges ended up fully soft from roasting in the pan juices, and some still remained a little firm. I used the soft oranges, the pulp pretty much dissolved, and sliced them into julienne and scattered over the lamb. It really added a bright note.
I liked this slow roasted treatment of lamb—something new to add to my own lamb traditions and assumptions. The shoulder was actually less commonly available than leg of lamb at this point in the year, but we did find a nice 4.8-pound shoulder.
I did the recipe as written except I could not find Seville oranges so I substituted a navel orange and a lime. (I think a closer approximation might be a Valencia or tangelo and an extra lime as this substitution works well when making marmalade.) I chose a bottled pomegranate molasses that did not have sugar added (Carlo brand) to get a purer pomegranate flavor and I used ancho chile powder.
The most important thing I WISH I had on hand for this was a 2-gallon, heavy-duty, resealable plastic bag, which would have made it much easier to manipulate and massage the lamb in the marinade. I used a plastic produce bag, and placed it inside a larger vessel for the overnight refrigeration. Plan on at least 90 minutes for the lamb to come to room temperature. After 2 1/2 hours at 300℉ (149°C), the lamb had an internal temperature of about 145 to 150℉ (63 to 66°C). After brushing on the pomegranate molasses and increasing the oven temperature to 375℉ (191°C), the surface was browned evenly and the internal temperatures was 157℉ (69°C) before tenting it with foil to rest. This was nice but not entirely falling-off-the-bone tender. I knew we would be eating only a portion and reheating the rest in subsequent days, so that was okay. The roasted garlic cloves were mellow and lovely to use on sandwiches.
I had a chance to try this recipe a second time, prompted by an offer of Seville oranges from a home garden, and while I couldn’t readily source another shoulder, I tried the recipe again with a boneless leg of lamb and 2-gallon heavy resealable freezer bags, which made massaging the marinade so much easier. I was a little more generous with the ancho chile, cumin, and fennel and, per a request from my spouse, more restrained with the cinnamon, using a smaller, 2 1/2-inch cinnamon stick.
After coating the lamb with the pomegranate molasses, I immediately put the lamb back in the oven but began the timing of the next 20 minutes AFTER the oven temp had come back up to 375℉ (191°C). This gave it an additional 10 to 15 minutes in the oven as the temperature came up and I got a nice crust as I typically do with my normal cooking method for lamb, whether boneless or bone-in. Serving is simpler with the leg of lamb, and if you are serving people who prefer leaner meat, this might be a good alternative. The Seville oranges give up more juice and flavor (and, tasting one, it still retained its distinctive sour-bitter notes after cooking, even though they were totally soft). The pomegranate worked well without dominating in a too sweet way. This is a great treatment to add to my lamb arsenal and won a place in this Greek girl’s culinary heart.