Wash thoroughly the lamb, especially in the neck. Allow it to drain well and season to taste. Then carve the legs in front and in the back and put salt and pepper inside them. Also, carve the armpits and the back and season to taste.
Put the lamb on the spit and fasten its neck and back with wire. Fold the back legs crosswise and also tie them with wire. Then, as it is set on the spit, sew the belly with string and bake it for 3 ½ hours, turning it quickly in the begining, so that it doesn't catch fire and slowly after a while.