Fetch content from CMS page by Id - prestashop 1.7

$FeaturedReceipe = new CMS(6, self::$cookie->id_lang);

self::$smarty->assign('FeaturedReceipe',$FeaturedReceipe);

$FTitle = $FeaturedReceipe->meta_title;

$FContent = $FeaturedReceipe->content;

$ETitle = $FeaturedReceipe->extra_title;