You will be given a definition of a task first, then some input of the task.
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.

Saute red and sweet onions in 1 T. butter, stirring often, in a nonstick over low heat until softened, about 30 minutes, then transfer to a bowl and set aside., In same pan, saute leeks in 1 T. butter until softened, about 30 minutes, then add to onions., Saute pearl onions and shallots in 1 T. butter until softened, about 15 minutes, then add to onion mixture., Saute garlic in 2 T. butter for about 30 seconds, then add heavy cream. Cook until thickened, about 15 minutes., Combine onion and cream mixtures; pour into a 2-quart baking dish., Mix panko, parmesan, parsley, pepper and melted butter and sprinkle over onion mixture. Bake in a preheated 375-degree oven for 45 minutes to 1 hour until brown.
Output:
only, red onions, sweet onions, pearl onions, shallots, garlic, butter, heavy cream, breadcrumbs, parmesan cheese, parsley, black pepper, butter