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, cocoa,and,cornstarch real good in a double boiler.,Add the milk,and mix well.,Add the egg yolks, beat with a beater until mixed good.,Add vanilla, salt and butter. Cook in the double boiler until thick.,______,Pour into pie crust.
Output:
Stir often.