Question: how much will 1 kg lamb feed?
Answer: Boneless lamb shoulder is usually rolled and tied. A 2.25kg shoulder should serve 6-8 people, and again if you're cooking for a smaller crowd, a half shoulder is a good option. If you're cooking a boneless leg or shoulder, you'll need to allow 225g of meat per person, so a joint for 6 should weigh between 1.5 - 2kg.