You can say "un acteur" and "une actrice" to differentiate the gender of the person who is acting. Is there a way to differentiate the gender of a chef (de cuisine)? If it is important to emphasize that the chef is a lady? Serious try: La chef? Wild try: La chefice? If Jamie Oliver is "le chef", could Nigela Lawson be "la chef"? Or la chefice?