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.

Combine ingredients., Heat to boiling., Cook slowly, stirring frequently, till vegetables are tender., M.B., Horsky, Simpson, PA.
beets, onions, cabbage, red sweet pepper, celery, salt, sugar, cauliflower, celery, vinegar