You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Mix sugar, flour and cocoa.,Stir in milk.,Cook, stirring often, until thickened.,______,Beat yolks.,Temper eggs with small amount of hot mixture before adding to the entire hot mixture.,Cook a few more minutes; remove from heat.,Add margarine and vanilla.,Stir.,Pour in baked pie shell.,Top with meringue.
Output:
Separate eggs.