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.
Leg of lamb is a thick cut, making it best suited for roasting. Roast bone-in leg in a 325 degree Fahrenheit oven for 20 to 25 minutes per pound (or until a meat thermometer measures 145 degrees Fahrenheit) for medium rare.