Put rosemary sprigs and garlic slivers into small incisions in the lamb.
Mix together coating ingredients and brush over the lamb.
Place joint on a baking sheet. Bake in preheated oven 180 °C, 160° C fan, Gas 4 for 25 minutes per lb plus 25 minutes. Baste occasionally.
Remove joint from oven, place on a warm serving dish, and cover with foil and leave to rest.
Meanwhile skim off the fat from the meat juices. Add Knorr Gravy pot and stir into meat juices until dissolved.
Add hot vegetable water and bring back to the boil, stir in mint sauce, and any meat juices that have come from the roast lamb and simmer for 1 minute.
Recipe courtesy of Knorr