Pizza Express is serving ritually-slaughtered halal chicken in every dish on its menu that uses the meat, it has emerged, but customers are only told that the chicken they are eating is killed in line with strict Islamic law if they ask staff, as it is not stated on menus. Under Islamic law, chicken can only be eaten if the bird’s throat has been slit while it is still alive. A Koranic verse is also recited during the ritual. Some non-Muslims object to halal because they claim the method of slaughter can cause unnecessary suffering. …