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.

Place sugar, milk, egg yolks, flour and butter in double boiler., Cook until custard forms., After custard cools, add nuts and vanilla., Spread between layers., Cover with chocolate frosting.
chocolate cake mix, sugar, milk, egg yolks, flour, black walnut meats, vanilla, butter, chocolate frosting