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.
Put the lamb inside an oven bag and place in a roasting dish. Secure the bag and pierce several holes in the top of the bag to allow steam to escape. Bake the lamb in the preheated oven; a 2 kg leg of lamb will take 2 hours 40 minutes to cook.