Definition: 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.
Input: Berries with hollow cores should not be used.,Combine berries and sugar; let stand 3 to 4 hours.,______,Cook rapidly until thick, about 20 minutes.,Add lemon juice and continue cooking 10 minutes longer.,Pour, boiling hot, into sterilized Ball jars. Adjust caps.,Yield:,About 4 half pints.
Output:
Bring slowly to boiling, stirring occasionally until sugar dissolves.