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.

Mix all ingredients together. Place in fridge and let sit over night., Optional: Hollow out a bread bowl (pumpernickel or the like) and fill with dip. Heat in 350 degree oven for about 1/2 hour and use the bread pieces for dipping., Serve with a good sturdy cracker (Stoned Wheat Thins are perfect)
Mayonnaise, sour cream, green onions, water chestnuts, Mix