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 Rub 3 tablespoons olive oil over the surface of the leg of lamb. 2  Place on rack in center of roasting pan and place in preheated oven. 3  Cook for 15 minutes at 450Â°F and then lower heat to 350Â°F for rest of cooking time of 1 1/4 hours (or, alternatively, lower heat immediately and cook at 325Â°F for adjusted cooking time). Rub 3 tablespoons olive oil over the surface of the leg of lamb. 2  Place on rack in center of roasting pan and place in preheated oven. 3  Cook for 15 minutes at 450Â°F and then lower heat to 350Â°F for rest of cooking time of 1 1/4 hours (or, alternatively, lower heat immediately and cook at 325Â°F for adjusted cooking time).