Given the task definition and input, reply with output. In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

Cook hamburger; warm beans., Put ground beef, refried beans and cheese in a cake pan., Heat it until cheese is melted, with olives and onions on it., Then put tomatoes, sour cream, guacamole and the rest of cheese on., Then it's ready to eat with some chips.
hamburger, beans, olives, tomatoes, onion, cheese, sour cream, guacamole, chips