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.

Brown together hamburger and onion., Mix all together and leave until soft., Mix again well and bake in loaf pan for 1 hour at 350., Leave uncovered.
hamburger, onion, cream of chicken soup, milk, cream of celery soup, croutons