Place the lamb in the oven. For cooking time allow 30 minutes per 500g. Cover the lamb with foil after 20 minutes to avoid it becoming too brown, then uncover for the final 20 minutes of cooking. Top up the water a little as the lamb cooks to avoid the lamb drying out.
PSI: Packet Switching Interface: PSI: Population Services International: PSI: Psychiatric Solutions Inc. PSI: Public Services International: PSI: Product Stewardship Institute: PSI: Patient Safety Indicators: PSI: Public Sector Information: PSI: Policy Studies Institute (UK) PSI: Paul Scherrer Institute (Switzerland, Joint Institute of ETH) PSI: Pet Sitters International: PSI: Psionic
You will also come across psig, which just means pressure above atmospheric, it stands for psi gauge, as a gauge normally reads zero at atmospheric pressure. If you see psia, this means psi absolute, the pressure above vacuum, where atmospheric pressure = 14.5 psia.