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Preheat oven to 375ºF. Line a roasting pan with aluminium foil and place a rack in the pan.
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Combine crushed garlic, rosemary, lemon juice, mustard, olive oil, salt and pepper; mix well and rub mixture all over the lamb.
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Roll the lamb and use butcher’s twine to tie it together and place it on the prepared roasting pan.
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Roast in the oven until medium-rare and a meat thermometer inserted in centre reads 135-140ºF, anywhere from 70 minutes and up depending on the size of your roast.
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Remove the lamb and let it rest about 15 minutes on a cutting board. Keep in mind the temperature will increase a few degrees once it rests.
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Slice lamb into 1/4-inch thick slices and place on a serving platter.