Q: 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.
Heat one cup of milk and the sugar until the sugar is free from lumps.,Mix the cornstarch, one-half cup of milk and egg yolks; add to the hot mixture slowly.,______,Add butter. When cool, pour into a baked shell.,Cover with a meringue made from the stiffly beaten egg whites and powdered sugar.,Brown in the oven.
A:
Cook in a double boiler until thick, stirring constantly, then for ten minutes longer.