1.
2.
Chop the cloves of garlic in half and arrange on an oven-safe sheet together with the chopped onion. Add the lamb shoulder and drizzle with olive oil, white wine and rosemary mixture on top.
3.
Roast for about 3 hours at 325 ºF and then for about 30 minutes at 425 ºF to crisp it up. Leave to rest for at least 20 minutes before serving.