One can find the translation of Asbab al-Nuzul (i.e. the contexts and occasions of the Revelation of the Qur'an)into English by 'AlÄ« ibn Ahmad al-WÄhidÄ« (d. 468/1075), who is considered to be the earliest scholar of the branch of the Qur'anic sciences known as AsbÄb al-NuzÅ«l.
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.
Roast the lamb for 30 minutes. Place the roasting pan in the oven and roast at a high temperature for half an hour. This will create a delicious crust around the leg of lamb.