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Rub the lamb all over with olive oil, salt, and pepper. Make small slits in the meat and insert slices of garlic into them.
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Place the onions, carrots, and potatoes in the bottom of the slow cooker to form a bed for the lamb. Lay the lamb roast on top of the vegetables.
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Add the rosemary and thyme around the meat. Pour the stock and red wine (if using) into the slow cooker.
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Cover and cook on low for 8–9 hours, or on high for 4–5 hours, until the lamb is tender and easily pulls apart with a fork.
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Once cooked, remove the lamb and vegetables from the slow cooker.
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If you’d like a thicker gravy, pour the cooking liquid into a saucepan, bring it to a simmer, and whisk in a little cornstarch mixed with water until it thickens.
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Serve the lamb sliced or shredded with the vegetables and gravy spooned over the top.