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.

Combine sugar and cocoa in a small saucepan; stir in milk and butter. Bring to a boil over medium heat, stirring constantly. Cook 3 minutes, stirring constantly. Remove from heat; stir in chocolate and vanilla, stirring until chocolate melts. Serve warm or let stand 10 minutes to thicken.
sugar, unsweetened cocoa, milk, butter, chocolate, vanilla