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.
Tip: As a rule, roast a leg of lamb for 15 minutes per 500g, plus 10 minutes more. Allow it to rest for a good 15 minutes before serving to ensure the juices redistribute, making a perfect roast. Preheat oven to 180 degrees C. 2  Cut slits in the top of the leg of lamb every 3cm apart deep enough to push slices of garlic down into the meat. 3  Sprinkle salt and pepper generously all over the top of lamb. 4  Place several sprigs of rosemary under and on top of the lamb.