Detailed Instructions: 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.
Q: Put all ingredients in a pan and heat over a medium heat, While heating, whisk with an electric sauce mixer, or stir constantly with a wooden spoon, Sauce is ready when it suddenly expands. Turn off heat aimmediately and keep mixing, For cheese ssauce, mix cheese in to taste once base sauce is finished, Careful to scrape flour from bottom of pan and mix, or sauce will be lumpy, Slap in a blender if it's lumpy at the end and reheat
A:
Butter, white flour, Milk, Black Pepper