Make incisions into the lamb and place slivers of garlic in them. Brown the meat for about 15 minutes in a frying pan with a little olive oil and then place it in a roasting tin.
Add all the ingredients except the potatoes, season and cover. Roast in a preheated oven (200oC) for an hour.
Add the potatoes and roast further until cooked. Uncover for the last 15 minutes to brown meat and potatoes.
Serve with green beans sautéed in garlic butter and lemon juice