Clean the lamb shanks and pat them dry with paper towels. Season generously with salt and pepper, then place in a large roasting pan.
In a small bowl, combine the olive oil, crushed garlic, fresh rosemary sprigs, and lemon juice. Rub this mixture thoroughly over the lamb shanks.
Place the thickly sliced onions, carrots, and celery beneath and around the lamb shanks in the roasting pan.
Pour the red wine into the roasting pan, then cover tightly with aluminum foil.
Roast in a preheated oven at 320°F (160°C) for 2 hours. Halfway through, turn the meat to ensure even cooking.
Remove the aluminum foil and increase the oven temperature to 390°F (200°C). Roast for another 30 minutes, or until the lamb shanks are beautifully browned and have a crispy crust.
Let the lamb shanks rest for 10 minutes before serving with grilled vegetables or mashed potatoes.
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