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.
Insert meat thermometer so tip is in thickest part of lamb (not resting in fat). Cook until the lamb roast reaches an internal temperature of 120 degrees F. Remove from oven, cover with aluminum foil, and let sit approximately 15 to 20 minutes. Remember, the lamb roast will continue to cook as it sets.he term boneless means the leg bone has been removed from the lamb roast. A boned, rolled, and tied or netted leg is easy to roast. You can easily find this type of lamb at most large grocery stores or super markets. For a generous serving of lamb roast, figure on 1/2 pound of lamb per serving.