Preheat the oven to 300 F.
Pat the lamb dry. Make small cuts all over the surface and tuck in the garlic slices.
In a small bowl, mix the oregano, rosemary, thyme, lemon zest, lemon juice, paprika, salt, pepper and olive oil into a paste. Rub the mixture all over the lamb.
Place the potatoes, onion, carrots, celery, bay leaf and lemon wedges in a large roasting pan. Season lightly with salt and pepper.
Pour the stock or wine into the pan.
Set the lamb directly on top of the vegetables.
Cover the pan tightly with foil.
Roast for 3 to 3 ½ hours, basting once or twice.
If the pan looks dry at the halfway point, add a splash of stock around the edges.
Increase the oven temperature to 425 F, remove the foil and roast uncovered for about 20 minutes until the lamb is browned and the potatoes are crisp.
To Finish: Let the lamb rest for 20 minutes before carving. Use a sharp knife to slice the lamb against the grain for the most tender pieces. Strain any juices from the pan into a small pot, reduce briefly and brighten with a squeeze of lemon. Spoon the sauce over the lamb and potatoes when serving.
Serving Suggestions: Serve with a Greek salad, crusty bread or roasted seasonal vegetables. Spoon the lemony pan sauce over everything. Leftovers make amazing sandwiches or pita wraps with tzatziki.
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