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.
Step 1: Trim roast (we used a leg of lamb). Weigh and calculate cooking time-for lamb allow 25 to 30 minutes per 500g. Place on a trivet (roasting rack) in a baking dish.This allows the meat juices to drain form the roast.rim roast (we used a leg of lamb). Weigh and calculate cooking time-for lamb allow 25 to 30 minutes per 500g.