The function of the speaker it to talk about the topic for which s/he was engaged, or to the common interest of the group. If you mean an electronic device, a speaker is to â¦ amplify sound. 2 people found this useful.
How long it takes to cook a leg of lamb depends on how you well you  like the meat cooked. If you like it rare, it takes about 15  minutes per pound, if you like it medium i â¦ t takes about 25 minutes  per pound, and 30 minutes for well done.
The size of your leg of lamb depends on how many you are cooking for. A 6 pound (2.70kg) leg of lamb will feed about 8 people so you can judge by this what weight you will need.Your butcher will even sell you half a leg if it is just for 2 people, so ask him for what you need. On the other hand if you buy a larger one you will have lots of meals from it. Pre-set your oven to 230Â°C (450Â°F/Gas 8). Â· Brush the lamb with melted butter or use a mix of butter and olive oil. Â· Place the lamb in the roasting tin and put into the pre-heated oven for about 15 minutes. Â· Turn and baste the lamb every 15 minutes, or until it starts to brown on all sides.