Shoulder of Lamb with Mint Harissa

This slow-cooked lamb is flavoured simply with rosemary and garlic. The lamb in Marsa Matruh is lean and small, with a typical shoulder weighing approximately 1.25kg (around 2¾lb). For larger cuts (the leg would be wonderful too), you will need to adjust the cooking time and make sure that there is always liquid in the pan. Serve with a fresh mint harissa on the side.