Brown the lamb in a casserole over a medium heat. You shouldn't need any oil as the meat should release its own fat. You can prepare your other veg while you keep an eye on the lamb, or if you prefer, you can have everything ready in advance.
Once the meat is browned, add the vegetables and apricots and mix into the lamb juices.
Add the spices and the stock and stir well. Cover with the casserole lid and transfer to the oven. Let it gently cook for about 2 hours. You can give it a stir after an hour, adding more hot water if you think it needs it.
In the last 10-15 minutes of cooking time, prepare your side vegetables or the couscous so that it is ready to serve once the tagine is done.