1 Mix the onions, garlic, lemons and herbs together and rub into the meat, making sure that the whole joint is covered. Cover and marinate for at least 48 hours.
2 Cut slits into the meat and stuff with a mixture of the cheeses. Place the lamb bone side down on a roasting tray and roast for 40 minutes. Remove from the oven and set aside to rest. Season with coarse salt and freshly ground black pepper before serving.