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.
1 Cut slits in the top of the leg of lamb every few inches, deep enough to push slices of garlic down into the meat. 2  Salt and pepper generously all over the top of lamb, place several sprigs of fresh rosemary under and on top of the lamb. 3  Roast at 180 C / Gas mark 4, until the lamb is cooked to medium well.s a rule, roast a leg of lamb for 15 minutes per 500g (1 1/4 lb), plus 10 minutes more. Allow it to rest for a good 15 minutes before serving to ensure the juices redistribute, making a perfect roast. Pushing sliced garlic into a leg of lamb can be time consuming.