Cook over high heat until skin is charred, turn peppers while cooking so entire pepper becomes charred. (aggieskitchen.com)
Continue until the entire pepper is charred. (foodtasia.com)
Meanwhile, roast your poblano peppers: Place peppers on a baking sheet and place under hot broiler until very black, turning once to ensure the entire pepper is blistered and blackened. (thewickednoodle.com)