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

2 cups chopped onion, 1/2 cup chopped celery, 1/2 cup chopped green pepper, 1/4 cup butter, cubed, 2 garlic cloves, minced, 1 can (10 ounces) diced tomatoes and green chilies, undrained, 1 cup sliced fresh mushrooms, 1/4 teaspoon cayenne pepper, 1/2 teaspoon salt, 1 pound catfish fillets, cubed, Hot cooked rice, optional, Sliced green onions, optional
onion, celery, green pepper, butter, garlic, tomatoes, mushrooms, cayenne pepper, salt, catfish fillets, rice, green onions