Below is the downloadable version of the below recipe.
This impressive roast lamb is perfect for larger gatherings and special occasions like Easter and Mother's Day. The lamb only takes 1 to 1 1/2 hours to cook, depending on the size of your roast.
Stuffed Rotisserie leg of lamb with Spinach, Feta & Walnuts
2.5 - 3kg boneless leg of lamb
2 teaspoons kosher salt
1 teaspoon freshly ground pepper
2 tablespoons chopped garlic
1/4 cup fresh mint chopped
1/4 cup Italian parsley chopped
1/2 cup walnuts
1 lemon zested
170g feta cheese good quality
150g fresh spinach or about 1 cup of thawed frozen spinach
Butterfly the lamb so that it lays flat in a mostly even layer. To do this, start at the thinner side of the lamb and look at it straight on, so you can see the thicker and thinner parts and how much butterflying needs to be done. Make shallow, horizontal slices into the thicker part of the meat (look for where the thin part starts to increase in thickness), about 2.5cm deep, folding the meat open as you make those cuts. Continue in this manner until you've laid the lamb leg open into a fairly even layer.
If you have a larger flap that hangs off of the roast, independent from the rest, you can leave it attached, or slice it off to wrap and freeze for stews or kebabs later on. I removed the extra flap, just to make the unrolled lamb leg a long, even piece that would roll up more evenly.
Turn the butterflied lamb over so the fat side faces up. Trim the lamb of excess fat, silver skin and sinew. There should be some fat, but not too much.
Cover and set aside.
Make the Stuffing
Preheat the oven to 180°C. Spread the walnuts on a baking sheet and toast for 10 minutes or until browned and fragrant. Transfer to a mini food processor and pulse to chop the nuts finely. Transfer the nuts to a medium bowl.
Roughly chop the garlic, mint and parsley and transfer to the food processor to chop more finely. Add the herb mixture to the walnuts. Add the lemon zest.
If the feta is in large chunks, break it up and pulse a few times in the food processor. If the feta is already finely crumbled, add directly to the walnut and herb mixture. Toss to combine.
For fresh Spinach
If using fresh spinach, bring a medium pot of water to a boil and fill a medium sized bowl with ice and water.
Add the fresh spinach to the boiling water and cook for 30 seconds, just until the spinach wilts, but is still bright green. Quickly transfer the spinach to the ice bath to stop the cooking.
Transfer the spinach to a fine mesh colander to drain. Once drained, place the spinach in a clean dishtowel and ring it with your hands to squeeze out any excess moisture over the sink. Transfer the spinach to a cutting board and chop it. Transfer the spinach to the stuffing mixture.
For frozen Spinach
Thaw the spinach completely. Transfer the spinach to a clean dish towel and fold it up into a cylinder. Ring the excess liquid out, squeezing firmly with your hands and twisting the ends of the towel over the sink until the spinach is very dry. Transfer to the walnut feta mixture and stir well to mix the stuffing evenly.
For the Lamb
Season the butterflied leg of lamb on both sides with the kosher salt and pepper. Rest the lamb, fat side down on a large work surface or cutting board. Spread the stuffing evenly along the length of the leg of lamb.
Roll the meat up into a spiral. Don't roll too tightly or too gently. Too tight and the stuffing will ooze out, too loose and it won't hold it in.
Use 5-7 pieces of kitchen twine (cut to about 50cm lengths) to tie the roast together every 3 - 5cm or so. Tie twine around the roast both horizontally and vertically to ensure that it holds together. Trim the excess pieces of string from the roast.
Prepare the Rotisserie
Assemble the rotisserie according to the manufacturer's instructions on your grill. Heat the grill to 205°C using an indirect cooking method.
Lay a drip pan under where the roast will go to catch any juices or filling that may come out.
Afix the tied, stuffed leg of lamb to the rotisserie and begin cooking. Check on it about 30 minutes into cooking to verify the integrity on the spit.
Depending on the size of your leg of lamb will determine how long it needs to cook. For medium rare lamb the optimum temperature is 51°C, however the lamb will continue cooking after you remove it from the spit. I recommend removing it when a good instant read digital thermometer reaches about 5-7° less than the optimal temperature.
To Roast in the Oven
Not everyone has a gas grill or rotisserie, but that's ok. You can roast your butterflied, stuffed lamb in the oven.
Preheat the oven to 250° C. Place the tied roast onto a roasting pan with 5cm sides.
Slice a medium onion and transfer to the roasting pan. Add 2 teaspoons of olive oil and toss the onions to coat. Spread the onion out in an even layer on the bottom of a roasting pan. Rest the tied lamb roast on top of the onions and roast for 45 minutes to an hour, depending on how large your roast is.
Check the internal temperature of the roast to gauge where it is in the cooking process. When it reaches about 5-7 degrees below your desired doneness, remove the roast from the oven and transfer to a cutting board to rest for 15 minutes.
Carving & Serving
Remove the lamb from the spit and let it rest on a cutting board for 15 to 20 minutes before carving, so the juices can redistribute.
Use a sharp carving knife to cut the lamb into 1cm thick slices. Arrange on a platter and serve.